In my experience every Cherry switch has a spot where they excel at; Cherry MX Browns are great for RPG gaming, dota style games, and RTS's. The slight bump is a nice thing to have so you don't miss type. Cherry Blues are excellent for typing essays, posting on forums or doing anything that involves lots of typing. Cherry MX blacks are amazing for FPS games. A linear switch is ideal for rapidly running around the map and general fragging
Cherry MX Reds are also good for FPS games if you like a lighter touch than the black switch. However Cherry MX Reds are best for playing a game called Stepmania. The lightness and linear press are a godsend when doing really hard keyboard only songs. I haven't used any Cherry MX Clears to have a credible opinion, but I am sure it has a strong spot as well.
I haven't tried blues, but my unicomp is excellent for general typing and programming.
Also, I play "frets on fire" with my CMstorm in Reds, it's great to be able to hit them lightly, though I could use a RD almost as effectively (if it had 6KRO, i'd probbably still use it: it get a pounding)
Browns are a good choice, They make a good all 'rounder for my computer.
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I haven't tired one, but there sholudn't be two bumps with the MX blue. I think the reason they have that second sliding piece is for more tactility, especially at and after activation.