CharlesRyan
Adventurer
I give feats on every odd level, along with a stat bump on even levels. This is in a low-magic-items campaign, so it balances all right. (Among other things, I don't have stat-boosting items in my campaign.)
I also use the Flaws system from Unearthed Arcana.
As mentioned, the overall effect of the souped-up progression is only an extra 3 feats over 20 levels (maybe 2 feats over the 12 or so levels that my campaign is actually likely to last), along with 5 points of stat boosting over 20 levels (3 over 12). So while it feels like a real boost to the players, it isn't really driving power levels over the top even if you don't change how magic items are given out.
I also use the Flaws system from Unearthed Arcana.
As mentioned, the overall effect of the souped-up progression is only an extra 3 feats over 20 levels (maybe 2 feats over the 12 or so levels that my campaign is actually likely to last), along with 5 points of stat boosting over 20 levels (3 over 12). So while it feels like a real boost to the players, it isn't really driving power levels over the top even if you don't change how magic items are given out.