Stemmed from the discussion from the shoutbox.
Just wtf is up with Logitech's new mice (g400, g400s, g500, g500s, etc)?
Their QC has gone to

with the latest generations.
After my G5v2's scrollwheel died from 8 years of service, I've been using my trusty Logitech M310 wireless mouse. It's been going good for about a year now. Excellent battery life, consistent clicks and scrolls, and decent feet. It is compact, but quite ergonomic.
My birthday was a few days ago and my room mate got me a Logitech G500S. Now I was pretty excited to use it but after an hour, my index finger started cramping from the scroll wheel! The scroll wheel is raised quite a bit higher than on the g5v2 and the g400/s. It is also quite loose feeling, and I absolutely hate the hyper scrolling.
A friend of mine had the g500 but after some time he had the double clicking problem and eventually replaced it with a used g5v2. He has been using it for a year with no problems.
Now... he got me the G400S instead yesterday. Now the scrollwheel is more of what I'm used to, although a bit on the stiffer side. However, the left click was so inconsistent with the right! It's stiffer, louder, and vibrates the whole damn mouse. Wtf is up with that?! I'm returning both the G500S and G400S and buying a refurb g5v2 off of ebay instead.
My room mate actually has the G400 right now and though the clicks and scrollwheel seem to be fine, his side button is mushy. Another friend of mine has the g400 for about at least a year, and he has been experiencing the double click problem ocassionally. It's only time before it completely dies.
So, what's up with Logitech's QC on their last two generations of mice? Is it because they're using a cheaper material for their mice, or that their QC section lacks competance?

What mouse and keyboard do you guys use, and what do you guys think of Logitech's new mice and QC problems?
Below are some pics that I took back when I was into the whole keyboard hobby.
1. Logitech G5v2
2. Realforce 87u 55g "Sakura", stock PBT white & pink keys w/ white case. Also a Pink ClickClack Skull (not shown in this pic) - My current favorite keyboard and the one I use at school.
3. Realforce 87u 45g, stock PBT white keys w/ black case - Second favorite, used at home.
4. CM Quickfire Rapid MX Blue, red painted case, imsto red dye-subbed PBT keys
5. CM QUickfire Rapid MX Blue, Engraved white PBT keys