I am actually quite surprised that this has not taken off faster than it has already, what is stopping this from exploding? I haven't reviewed the code, but there does not seem to be any complaints from current users, so why has it not gained extreme attention?
Two reasons:
1. The software is still a little buggy, not in ways that should lose money, but in ways that make the client hard to use. I have yet to fix some annoying crashes.
2. Until the OP_CHECKLOCKTIMEVERIFY changes are adopted by each coin, there is a TX malleability attack that can let the counterparty steal the funds that should have paid out to you.
I'm working on building out all the code, so #1 should not be a major issue for long. But #2 waits on the coin developers to merge the OP_CHECKLOCKTIMEVERIFY changes. This is very likely to happen since a lot of other protocols rely on this change, but all I really can do is wait.
I'd say, don't wait for altcoins, we can use bitcoin testnet and trade them for real bitcoin, or testnet for testnet coins.
Assuming bitcoin has this feature.