I bought the iGo rechargeable Alkalines a while back. So far, they are great. They pack a lot of power - very slow to run out on my XBox controller compared to NiMh batteries. Also, they have great shelf-life in the sense that they don't discharge when they are sitting in a drawer. You can charge them and store them until you need them.
I have read, however, that rechargeable alkaline batteries lose capacity rather quickly with multiple rechargings. This may well be. I have not had these long enough to say how they fare long-term.
I can, however, say the charger is really great. It can charge my NiMh batteries and the rechargeable alks (not at the same time) and has a handy indicator for the charge level as they are charging. Neat.