I have just started using it over the last day or two.
- Reliability: Seems good. So far has been very stable
- Transparency: Poor. You have no idea what is being mined
- Payout: Seems decent so far. You can compare your hashrate to other users to get an idea of what to expect
- Ease of Use: Great! You don't even need an account, just use your wallet as your user
In my opinion if you are looking for a super easy pool that converts to BTC, it seems great. Myself, I plan to mostly use it as an easy failover pool.