My son purchased a "Rad" for his wife as a Christmas present, and it's perfect for her. It's powerful enough for her to ride my 10 year old granddaughter on the back. These bikes, while not for everyone, aren't going away. The price was reasonable with $200 off when he purchased it. My only problem with rear hub systems is they are murder on my body when ridden over uneven terrain, a problem that wasn't evident with a front hub.