I just picked one up too. It is fantastic. Mine is a mid-level model ($6,500) and it really help me keep my HR down on long climbs. Range is pretty good too. The only quibble is that it is heavy-ish. I'm guessing around 28 lbs but will weigh it soon. So once you are beyond 28 MPH assist max speed, you can feel the weight. That is mostly on mild downhills where you can still pedal fast. That said, it is really helping me get out more. I fell off due to my 100% travel job (that I recently quit) and my baby and my HR was scary high and this has helped me ease back into cycling quite well. The only disadvantage is the weight and some may not feel it anyway. My downhill speeds are lower for sure, across the board on almost all grades. The weight does make it slightly slower to stop and change direction too once you are at a higher speed, so you have to plan those fast curves more carefully. That is my experience so far.