Just wanted to chime in as an early satisfied Awesomic user. I always have half a dozen side projects going (as you can see via my "Show HN" history) and always have a little bit of design needs that I can't do via Bootstrap. I've been burned by upwork/fiverr in the past who charge $100/hr with no upper bound on the amount of time it will take to iterate on a design that will work. I've often just scrapped the design work entirely because it was too hard to get to the right end result.
The platform basically guarantees that I'll see some progress once per day (the predictability is nice), and I don't have to worry about using up my 1 revision, or whatever I'd agreed to. If I choose to spend the entire month on a single project to get it right, then great, I don't have to do a calculation every time.
Congrats on getting into YC!