I am a part of this project. I considered joining blitzortung, and still would, but I have had my name on the list for new kit for over a year and haven't heard anything, and the website has no clear instructions on how to get kits other than signing up on the list.
Mldn is nice because it's virtually plug and play. They send you the completed kit, wiring, and gps antenna, whereas blitzortung, you have to assemble it all. It is an investment, but I didn't mind. It's still a project that's in development, so there are little bugs here and there, but the admins are quick to help and assist. You do have to have the Boltek antenna and unit, so you don't have to build your own antenna.
I for one, think it's very cool, and am excited to see more stations come online.