Bought these shortly after Christmas, and upon reading of the horrors of setting them up I found out myself just how heinous a process it is. Even after fighting for over a half-hour for the clamps that hold the cymbal posts to the drum kit to "JUST...SNAP...JUST...SNAP..C'MONNNNNNNN SNAAAP!! GAAAUGH! %@!" with and without powertools (one of which never fully did snap 100% together), they worked beautifully, truly adding a new dimension and surprisingly seemed to make drumming a little easier for this non-musician to do-it-up more like a real one. Infatuated, I played for hours everyday for about a week straight before getting distracted from playing for that entire next week after.
The start of having these cymbals for that third week... was every optimistic-cynic's nightmare. Having known about the terrible setup, and still choosing to trudge on. Then experiencing the setup, and still going forward from that. Then experiencing a blissful 7-days of newfound drumming glory... to suddenly having DOUBLE-HIT!??
For no obvious, apparent, or investigative reason, my cymbals started double hitting any moderately-hard hit they registered. Which, if you do your homework, a lot of the disgruntled reports over these cymbals are about. If you just want to play and don't care about your score (and your score multiplier) then you won't care that this seems to be an unfixable and common problem with these.
But I, for one, also am now hanging my head low in mourning of what-was for a beautiful 7-day stretch, and what-could've been with properly designed cymbal accessories.
[PS. Also, feel free to assume that it's just me and my cymbal pack (and dozens of others out there) and trudge onward with your purchase! Best of luck to you, honestly, because they're sadly a great addition.]
***EDIT: On a whim I did some research and looked for "repair rock band 2 cymbals" since my warranty is now long up and figured I can't make mine any worse. Turns out, there IS a somewhat promising fix to these, but get this... after taking it apart to fix the wiring, I found out that one of my cymbals don't even include all of the wiring it should, FANTASTIC!***
Buy Rock Band 2 Double Cymbal Expansion Kit!