As a self confessed mouse addict and gamer lurking here for the longest time, I had to register to post because this mouse really excites me. I've always considered Madcatz mice (and their products in general) to be pretty ridiculous contraptions with the all-in-one customizations, usually ending up on the overkill. The only positive steps they made so far was the feature for optional sensors.
Now I'm still wary since there is so little information on the Rat 1 and it isn't available outside EU / NA. I often come close to finding the perfect mouse, but get put off usually by either the weight, size, shape, sensor or lack of side buttons. Some do come close, e.g. the Ninox Aurora, yet the QC issues made it unfeasible. I do agree that MadCatz has mostly made "garbage" but hopefully they can redeem themselves by furthering development on the Rat 1. Some potential features are very promising & may actually change my mind.
1. MadCatz usually "overkill" in features but now stripped away many redundant customizations - their price point is now realistic and the product is less tacky. Latest mice they have e.g. Pro X and the recent Pro S suggest a focus toward the "best in slot" sensors out there i.e the 3310. The Pro S weighs 77g - one of the lightest in the market - in range of the Finalmouse, the Ninox Fail-rora, Abysuss or modded G100s etc.
2. The Pro S still allowed some degree of customization for various grip styles. It is probably more flexible compared to the Mionix Castor which promises multi-purpose grips yet ends up somewhat in no man's land. Zowie came close with multiple iterations yet trying many can be expensive and time consuming due to shipping. The Pro S is still far from perfect, since the sniper button / side grip designs still leave much to be desired.
3. Then come the Rat 1 (I am somehow perceiving a development curve here Pro X > Pro S > Rat 1). Has decent 3320 sensor, with promise for sensor customization in future. I do hope they include the 3310, 3988 or 3366 etc. The sensor module currently does invite doubts based on the sensor's off center and forward implementation, but I consider the current version to be "beta". I see the potential of the sensor module having different switches, different m1/m2 coatings and sizes, and scroll wheels - allowing variable price points depending on needs. E.g.Implementing Omron or Huaron switches depending on your preference for "clickiness" or adding-on free-spinning "G502 wheels" modded or having memory for macros if desired.
4. The design vision seems to be have moved away from the dust trapping nightmare versions that plague most MadCatz models. Mid-chassis frame *looks* sturdy and being 3D printed allows flexibility in materials. The "open" mid-chassis area offers so many possibilities for side grip sizes, grip materials and side button configuration. And extensive modding without needing to tear apart your mouse can finally be a thing. Stuff like fancy "chroma" LEDs or profile switching buttons which I consider pretty redundant can be optional too. The tail end attachment which allows the elevation and length of the mouse to be adjusted depending on your grip is also awesome - always considered this to be a no brainer yet most gaming mice lack this feature.
5. What excites me the most however is how they managed to strip the Rat 1 down to 51g! The current offerings for modular weight mice are crappy since they all come with a high weight base, often >100g (plus laser sensors are usually used) and they put off casual gamers with the high price. The Rat 1 is promising since it gives so much room for features to be added on what I consider to be an amazingly low weight base, and the base price is pretty attractive (I'd go for the base Rat 1 over the G100s). I'm already imagining that I'd add only side buttons if I can and keep the weight to a minimum.
I don't know if Madcatz staff read this forum at all but I hope they do and hopefully follow up with the community to develop this product. It could be a real game changer, yet it could go the way of the Ninox. I hope I didn't get excited over nothing and the product turns up like nothing I'm expecting.