Well..in past experience, Donruss Leaf Playoff was very good. I had redeemed multiple cards over the years.
In recent experience, not so much.
I submitted a Glenn Dorsey in October 2008 (last year) and never received the card (or a replacement even though I took the 8 month option). I finally took it upon myself to contact them, who said I could keep waiting or take a replacement of their liking ("equal value")
So instead of my 1st round auto (Glenn Dorsey) jsy/auto, I now am the proud owner of a Brad Cottom (late round pick) rookie auto. Yeah, it's gold and numbered to 100, but whatever.
My experience with redemptions from Donruss has been really good. For unexpired cards I have received the card every time (around 10 of them) and I have even received cards that were expired, sometimes the card I asked for, sometimes not. I think they try a little harder than the other companies. When a few players from Donruss Classics football didn't sign, they sent me the cards unsigned as well as autos from other guys. I don't think they would ever send the redemption card back with an "EXPIRED" stamp like Topps does. Donruss quickly sends you an e-mail that they have received your card (even if it's expired) and once it's in their system, you're going to get something. I once got an auto over three years after it had expired!