ok, As I use 2 spaces I have to take a part in this discussion. For the first why do I use 2 spaces? That were old times when I first time saw m0nk (guy who used 3 spaces for playing as I heard later) whoes tap was amazing fast. I decided I wanna get same tap, as it was nice for me, and smth new, and then I thought it could be useful (but it's not much). For 9 months I used to played on 1 spacebar, as 2 spaces was a cheat for me. I changed my mind when I tried to use 2, and found out that 1 space is no sense. My tap got faster as 1 spaces wasn't fast enough (still down when u wanna press it other time). For more it's still about your timing, because it reacts only when u press it! Yes! If u press 2 spaces at once it even blocks u.
There are kbs with 2 spacebars on them. I think that winning should be more about skill, not a kb which u got (ofc I don't mean tarantula or G15, as it's other thing). I have even seen a phote one of them, somewhere on wQw forum, but can't find it.
I have been training fr since february 2008. It's really not easy way. My first lesson was: how to force my other finger to react... And when I got it, I wanna have smth more at last, because fr on 1 space = twiching, where I mean speed of tapping (well, we can take a look for a Mablak ofc, but he has put some thing under his space as I know, and he plays from long time, so it's possible ofc, but I'm talking about fr now).
About silkworms, utw and other it's cheat ifc, because as in 2 spaces the press depends on you, and your timing, those programs do the job for u.