I just wrote up this amazon review and wanted to share my experience thus far. I still can't decide what to do about it.
AFTER THREE DAYS HEAVY USE
Disclaimer: Regardless of my issues, I am not changing my four star review. The more time I spend using it, the more I find to like about it. If I give more focus to it's flaws, it's only because they stood out in such high contrast to the intuitive flow and natural ergonomics. Honestly, this mouse deserves a Savu Reboot or SavuV2 because it is just so close to amazing. I don't think Claw and Palm grip are mutually exclusive design parameters and I believe that a few small changes and a well run marketing campaign could jump-start Roccat in America. I'll be first in line if this happens.
Three days after delivery the scroll wheel is making a very loud, annoying squeak. It took my MX518 over two years to display a similar issue. I have a broken arm, so I'm probably pushing the limits on what might be considered heavy usage; but three days? I even paid for the next-day shipping.. I've heard that their support is great, hopefully I can resolve this quickly. Unfortunately, I won't be going with the same model. It's obvious that Roccat has a talented and ambitious design team, but there are a number of flaws that I assume will be worked out in newer mice. As far as I know, this hasn't been a larger Roccat quality control issue but an uncommon problem specific to this model.
However, I must make a few more points that I missed on my first impression.
PRO -- The scroll wheel seems solid, and comes with great options. Easy-Shift is completely ridiculous. Countless uses and with a manual profile swap you can have tons of linked macro setups for gaming and a separate browser profile. It weighs almost nothing. Seriously. This may be a personal choice, but I suspect that low sens FPS players will fall in love. Rather than giving me less control as I expected, accuracy and control were enhanced. Excellent design for Claw and or 'Paw' grip, just a pleasure. The left/right click are smoothly textured and placed perfectly; even more impressive are the well defined edges of these buttons. Angled sharply downward, they give a strong sense of position and relative space. There is a smooth section to rest your ring finger on, but the front/top edge is what pulls it all together. Look at the pictures to get a clear idea. The same downward angle is used on the / \ shaped mouse outline. Not only does it look great, it is incredibly effective in every grip. I've never seen anything like it on any other mouse, but it was the very first thing I noticed after the jarring sandpaper side grips. Words don't do it justice. Form meets function defined.
CON -- The size reminds me of that awkward stage between childhood and adolescence. Although the technical specifications show similar dimensions to the MX518, it's not quite big enough to classify as a medium mouse. Palm grip might not be possible at all for most people. I am 6'2 200 lbs with quite small hands, and I couldn't manage it. One of the side buttons becomes virtually unusable and my fingertips drag while the rest of my hand contorts in various ways to compensate. It weighs almost nothing. Seriously. I'm fine with it because I play with an 18in/360 @ 400 dpi, but much higher and I'd be concerned about adrenaline jitters affecting my aim. The DPI is not incremental and has only four settings, which was a surprise. Although the sandpaper textured grip is comfortable and unique, I doubt it's effectiveness. It's definitely more of a texture than any sort of grip. The fact that I can already see and feel it rubbing off doesn't help. The thumb rest is already streaked with smooth plastic. I'd imagine that once worn completely smooth, sweat could become a hindrance. It's alright to sacrifice in the name of aesthetics, but not at the cost of overall function! The driver software boasts a 16.9 million color range for the LED. It's too bad that there are maybe 16, and all of them impossible to see if you're actually using it. But honestly, even 16 is impressive, and I must admit that it does look nice on my desk.
I was slightly apprehensive about purchasing this mouse. Roccat isn't exactly a household name in America. However, I'm very pleased with it.
PRO -- The driver software is awesome, tons of options. The sandpaper grip is disconcerting at first, but I quickly got used to it. It also has a great ergonomic design, I would compare it to a Logitech MX518, but SLIGHTLY smaller. It's very light and the omicron switches are very responsive. It may be too small for a true palm grip, so if you loved your Deathadder I'd compare physical sizes, but I just slide my hand a bit further back.
CON -- My only real issues are that it wouldn't track on my shiny black plastic mat. Luckily I have a new cloth pad on the way. It desperately needs a third side button. The easy-shift macro toggling can only be bound to one of the two side buttons. I've been using them as front/back for web browsing for 20 years, there is no way I'm rebinding them.