REO all the way if you want a 3.7 volt bottom feeder. DH and I have had ours since last May. In that time we've had one collapsed spring from a bad atty, and he did snap the metal switch on his. Both repairs took less than 5 minutes, and were under $5.
Other than that they've suffered through a lot of abuse including a 6 foot fall onto marble floors, the beach, and my very dusty/messy job. I've gotten scars, but my REO hasn't.