I have a pal that owned the last version of the Johnnie Pag 250cc (single cylinder) chopper. He bought it as a third bike a few years ago. (had to keep up w/ Sarris' GZ, you know)
First, it's really hard to tell the scale of something in a photo without human reference. The JP is actually a smaller framed bike than the GZ. If the GZ is 4/5 full size, the JP is 3/5. I test drove it and found it to handle pretty good, but it felt like less power than the GZ, and boy is that bike small, almost like a mini-bike chopper. I could only manage 57 mph with my 6'-1" 280 lb ass aboard.
My pal had to have 2 frame cracks repaired (one at the streering head, and one at the hardtail just above the axle flange) and sold it after only 9 months with a blown motor. It was really a MC for 120lb 5'6" tall skinny Asian pepole, not 250+ lb 6' tall Americans. Chinese POS, but cheap and cute. My understanding as they are 100% Chinese parts and assembly, with the "final" assembly done in California. They have had very little resale value and are (were) essentially considered throw aways.
The new 300 cc twin looks nicer, bigger, and is more expensive. Hmmmmmm...........
My two cents.