That has been what has deterred me from going cellular. You may have a $100 camera working well, but how long will it last? Another thing - you're paying $10/month for up to 1000 pics.....that's $120 data + $100 camera = $220 that first year, plus taxes. $120/year thereafter.
Not too bad ($220) for when you're comparing that against a quality non-cellular camera for around $200..... you have the benefit of going cellular being only $20 more. BUT all of these cameras in the $100 range are sub-par IMO (Spypoint, Moultrie, etc....). Other than quality and customer service, longevity is what I look for. I love the concept, however, just not for my investments for now.
One more thing, say that $100 camera lasts 3 years and works flawlessly. That's 3 X $120 just for the data = $360. I'd take 2 more quality $200 cameras instead! You're just paying $40 additional dollars. So, in that 3 year period, you have 3 quality cameras instead of just one. That's just me - I always factor in the following years.