I've had a few spypoint flex m cameras for two years with no issues. I like to run rechargeable batteries in mine, and the spypoints won't work with NiMH batteries. They need lithium rechargeables or standard batteries. I think the picture quality was decent and on lower traffic areas it's nice to have the free plan.
I also have used stealth cam/muddy cameras because it's the cheapest cell plan, but I don't think they take the best photos. They work for what I need though, and they also last quite a while on NiMH rechargeable batteries as long as it isn't super cold out