Just bought a NanRobot D5+ from Amazon = $1550. It shipped from California and I got it in 5 working days. I did research for 3 months and watched many hours of YouTube videos. The choice was daunting. I'm 81 years old and wanted something to get to my mailbox which is a 1/2 mile from home. Too lazy to walk and hated to get out a car for the short trip. I couldn't justify Dualtron's cost. I'm happy with my choice but I don't have any thing to compare to. I wish I could rewrite the Owner's manual, though. I did own an Uberscoot 36V , lead acid battery, chain drive for a week before I bought the D5+. For me the criteria for a different scoot was: 1.No chain drive 2.Dual wheel drive 3. Minimum speed 25mph 4.Must have Li battery. The D5+ meets all those requirements. Speed mode 1 rides at 12mph, mode 2 rides at 22mph mode 3 gets to 36mph. I ride in mode 2, non-turbo, dual motors. On 20° inclines I punch TURBO and can actually accelerate up the hill up to the max mode 2 speed of 22mph. Overall quality is good. There is some steering head play but I attribute that to the folding mechanism. I would think all foldables are similar. The braking system is incredible! They call it EBS, I call it ABS. Takes a few rides to get used to, though. The throttle controller is similar to Dualtron's and I used their owner manual to figure out how to negotiate the modes. After owning theD5+ for a month I would still buy it.