A cheap option for many pedals. I hate batteries, so this is a must. Not independently isolated, and uses a wall wart rather than an internal power supply, but it works, it's cheap, and haven't noticed any noise issues with my pedals. I use this guy for Fuzz, Distortion, and OD pedals. Small footprint.
Honestly if you want something cheap and reliable for when you have a smaller board or you don want to spend big bucks on an isolated power supply, this is perfect for you. I use this guy for distortion, fuzz and a digital Tape Echo.