I had an Astro not too long ago but returned them. I am going to go back and get another pair soon since I am looking to simplify my setup, and am in the process of removing cables.
The Mixamp pro I will say skip it. It is geared toward console gaming. If you get it. You will be connecting optical from your PC, USB for power and voice chat, (probably going to have a battery pack in there as well). Then the headphones will connect to the Mixamp (this is what I had, and was turned off of the clutter). It is just a hassle when you could just plug the headphones directly into the computer
The wireless Mixamp, takes similar connections:
1x usb for voice chat which is driverless
1x power that goes to a wall outlet unlike the pro mixamp.
then the headset plugs into the receiver unit which takes batteries.
This will allow you freedom to move around your home with a wireless connection.
If this appeals to you, the clutter can be minimized and you have a pretty decent wireless headset.
If the wireless doesn't appeal to you, then I wouldn't recommend the Mixamp pro. The charging was gimmicky with the provided battery back (will be using eneloops with my wireless version). And the drivers were pretty annoying. Not to mention the big volume knob is useless, since it just acts as another volume adjustment (unlinked from windows volume). On PC, it doesn't balance voice and game like it does on console. So it's essentially useless (at least on the wireless version it allows adjustment of volume while you are distant from the computer).
As for quality, a decent sound card can one up any of the Mixamps, but is there a difference with/without...not really. I feel like they paid companies for the stellar reviews. Astros aren't all they are hyped up to be.
It takes a lot of work to keep a setup clean with those headphones. If your up for it I recommend it, if not, look elsewhere.
Edited by invena - 2/29/12 at 5:49pm