>> I've put roughly 18 (fast) miles on it so far and my shoulder blades and neck feel very good. She's an edgy rocket....<<

If this rides at all like my Rigi, it's a seat of your pants thrill, exciting in the same way a good roller coaster is exciting. Just be very careful at high speeds. My Rigi has this 'evil mind' thing going on. When I'm going really fast, above around 35mph, and I hit a bump, even just a little one, I feel like I'm going one way and the bike has gone schizoid. It goes where it wants to go, and you are *wrestling* to get it back under 'behavioral control'.

Scary as **** but wildly fun!