I thought I had issues with my R12 but it still works, and has over 4,250 miles on it over the last 13 months. I had to replace the rear wheel after about 5 weeks (~1,100 miles) as I was breaking spokes. Then that rim failed spectacularly but was under warranty. I had to replace the front wheel a few months later (crappy hub). I changed the rear sprocket to a 16 tooth one to increase my top end speed. Other than that, it hauls my ~225 pounds + panniers around fairly well. I do think the battery is dying, but I can still get my 15.5 mile trip out of it last time I tried a month or two ago.
I got a trek 1.2 road bike about 8 months ago and have been riding it a lot more once it cooled off out. I expect to get back to the R12 once it gets hot again.