Unlimited is often just a marketing term, and you are invited to leave the service if you actually use it. I don't really like that kind of marketing, but it is very understandable. A LOT of people out there think they want unlimited but only use 100GB/month.
DSLR users asking about unlimited probably mean 500GB+/month, and one should be very cautious about Xinflix or CIK. Of course I'm interested to hear real on the ground experiences though, for sure.--