Ever since I’ve been playing guitar, I’ve been using a capo. My capo of choice is the Kyser Quick Change Capo (shown to the left), but I’ve used Shubb capos as well. I prefer the Kyser because it’s great for mid-song key changes, something I learned from watching James Taylor play “Your Smilin’ Face” on a TV special years ago. Up to that point, I was using Shubb capos which are great for getting just the right tension, but forget about mid-song key changes.
Anyway, yeah, yeah, yeah… some “purists” call them “cheaters.” But I regularly play 4-hour acoustic gigs, and frankly, I just couldn’t do without a capo. Being able to Capo III play D to play a song written in F is a helluva lot easier than using all barre chords, plus it frees up my fingers to more complicated runs. To each, his or her own…
Guitar Gear 
Is it me or do only non-singers call them cheating? I’ve tried a few capos but always come back to Kysers. They’re just so simple to use, and look cool clipped to a headstock when not in use.
Kyser capos definitely rock! I’ve got one in every case and gig bag. They’re just so invaluable.
To your point about non-singers calling them cheaters, in general, I agree. The people I’ve met who’ve called them cheaters are straight-up players.
You simply can’t get non-EADGBE open ringing notes without a capo, unless you change tuning. And wouldn’t that be cheating too?
Funny that you mention that because changing tuning is exactly what I’ve heard from a few people. But my argument to that is that changing tuning affects overall string tension, which affects the bow of the neck. It might not be an issue for going up one or two half-steps, but it’ll surely be an issue for going up two or more whole steps, not to mention the possibility of snapping strings.