I own a pair of X1600's. Unfortunately after about 4 years of occasional use one of them has stopped working with my Buff triggers. I've sent it in for repair but it came back still not working. Not only will it not respond to the Buff triggers but the slave isn't working either. I'm waiting for a return call from their tech, which is overdue at this point. My group portrait season has just started and I'm down one of my two 640ws flashes.
I suspect that what you save by buying inexpensive lights, you give up in durability/longevity. If you're a casual shooter these are great but if your livelihood depends on it, you might look elsewhere.