Recently, I came across a few posts mentioning a decline in build quality for the 3.0 over the years.
I'm wondering if there's any truth to this. I've always known the wheel and buttons to be crap. Sensor is all right for somewhat low sens and higher.

I have the new one and the old one. Old one is slightly better but not by much. The sensor is the same.

I would say that the sensor is good enough for low and medium sens, but what I was trying to get at was that many modern mice, aren't as smooth as the WMO/ms3.0, even if they are still playable.

If I remember right the newer "Legends" 3.0 has better mouse feet?

I could be wrong

yea they come with some fairly decent teflon ones

I love my IMO 1.1 at 1000hz, the crappy wheel is really the only thing that bothers me.

Got rid of my other mice now, even my MX518 is collecting dust.

I'm working (internship) at STMicroelectronics (the company which made the WMO/3.0 sensor) and it's quite hard to make a perfect one, BUT, making a 400/800 dpi which is a quite low resolution sensor should not be as hard now because the technology behind the sensor (it's all about silicon) has growned and evolved over the years.
I don't know the real physical condition that make the sensor have pos/neg accel but I guess some pixels (at the edges of the matrix) don't measure the same information as the pixel in the center of the sensor, because they are badly built due to their position (not the same size, tilted...).

Maybe we should ask for a manufacturer to make a defaultless but low res sensor (800 dpi is fine to me tbh) for a gaming mouse, but we have to convince all the companies (Steelseries, Razer...) to buy that sensor :)

problem is that as long as the packaging does not have a sticker saying the mouse has over 9000 dpi ppl will probably not buy it because it must be shit with only 800 dpi :/

True. Now the casual gamer thinks that more they have CPI more the mouse is accurate/better or something, I looked to the post on Facebook for the Sensei of Steelseries and it was depressing :)

"The b3st mouse evaaaah !!§1§1§1" or something :D

But since companies want to build mouse with overpowered stats we can't do anything except making a post telling how to make the perfect mouse for us with the spec etc...
We already did it with linkin 1 year ago for Steelseries but we didn't had any answer.

Indeed, people still think higher DPI equals higher quality of mouse.
I've even heard people say, to quote "That's not an optical mouse, it has a red laser beneath it".

I am fine with having a 3600dpi mouse, but I want it to at least be smooth! The DA still jitters minutely, (old) Abyssus is practically unusable, 518mx has too much prediction. From what I read all new sensors have problems.

The only issue with the microsoft sensor was low dpi and negative accel, which gets fixed by raising the hertz.

what do you mean by prediction?

It smooths out your strokes artificially. I tried playing with it... I dunno if it was just mental, but it did feel different.

It might be a problem if you're not used to it, but I don't think it lowers your performance if you are.

hmm... weird.. i have a mx510 thats why im interested..

yes it has prediction. no it doesn't affect your ingame performance.

i prefer no prediction, but some players prefer it. it's kind of like another mouse value, some use accel, some dont.