Please allow me to add my 2 cents here as well...I recently purchased a bike from HPC. It is essentially their Recon, which is built using the Montague Paratrooper folding frame, with the only difference being that I wanted pedal assist and they installed a Thun bottom bracket for me. To my knowledge this was their first experience putting in a torque sensing BB, so I was a little nervous because I had committed to buying the bike. To my great delight it works flawlessly. The bike is simply amazing for it's power, durability, and smooth delivery of assistance...all extremely customizable using the Cycle Analyst v3. And I have folded it up numerous times and put it in the back of my car.
I intend to write a longer testimonial at some point with photos, but let me say that the guys at HPC have been fantastic all the way along. They have patiently answered every question I had from concept through delivery, and I had many! On more than one occasion I simply walked back into their work area with their permission of course to watch what they were up to and how they do things. Completely transparent. I had a couple issue early on that most likely were caused by my own gaffes with the bike, and they nonetheless took care of them no questions asked for FREE...as I had only recently taken delivery. Just cool guys.
I highly recommend them for anyone who wants a bike that far exceeds the abilities of most commercially available bikes, and that includes Stromer...at a very competitive price for what you are getting. The only sacrifice is in the aesthetic, as the large batteries and controller are quite visible so not much stealth factor to the bikes. Two thumbs up for HPC.