I find the sci-fire ones awesome, just too expensive for those in Europe due to the cost of shipping them plus customs costs.
I'm waiting for the Doopys mk3 to be tweaked to perfection, regarding the manufacturing process, to get mine. Casey has been so helpful and kind about keeping me informed about it all.
Here's some info about the mk3 Casey sent me a few days back, this after I asked about the new weight and differences from the mk2.