I've tried other similar products (like ServiceDesk Plus) and I would rather pay $50-$100/month instead of $1000+ per month.
If you want something where all your data stays local on-premise, this isn't for you. They don't allow for offsite backup or even replication. That's a dealbreaker for me since my datacenter has no Internet access.. so everything must stay within the firewall. But otherwise, it's great stuff!