I have a pk6. It wasn't to bad to solder together.I have used it 4 or 5 times without a problem. A while back it blew a fet, when I armed it the nose charge blew on the rail. I e-mailed John at transolve about the problem. He was very quick with the reply. He said it blew a fet and that he could send me one or repair it for 5 bucks. I was using the twist wires together method to arm it,he said it sould have a switch. He also said that it needed low current ematches, I use the ones Wildman sells because thats what we have around here. I don't know how low current they are. I sent it to John , he repaired it and I have used it 3 more times without a problem. I would recommend it for a low budget altimeter. I also own a MC G-Wiz and a MC LC-400. Mike