I know some guys who went there as Captains, one on the B737 and one on the 777. I know one guy (a highly experienced captain with an excellent reputation at my previous carrier) who bought the 777 type rating and didn't make it through training. I've heard the failure rate is quite high. The guys who have made it through seemed happy, but I haven't talked to any of them lately.
If anyone can shed any further light on the failure rate, that would be interesting.