Glad you asked. The fifth bike is my new daily rider that will be delivered in late July (God willing). It's a factory direct version of this amazing Ebike. I was fortunate to test ride this bike as well as the HD750 version and after one ride, I was hooked. As impressive as the specs and components are, this heavy machine rides like a dream.Wow, what's the fifth e-bike? I count four. that's awesome! You have a tall family. I ordered the LM-750 Rattan today and getting the XL LT thudbuster to lengthen the seat post (and may well buy a second beefier battery if needed) and have to wait now until August delivery but buying accessories ahead of time :-(. I stilll like the look of the Ecotric Bison, but it is a beast at 93lbs, but I have no storage space where I currently live and I can't haul that monster up to the 2nd floor bedroom.