It's a shame there were so many S4's out with problems.
Mine came in, I manually set difficulty, increased the frequency and consistently hash at 2.3TH no problem and no complaints.
Same here with my B2. My B1's PSU died, but it was replaced quickly. All in all I'm a fan of the S4s. CK's updated cgminer helped a lot too.
You are a fan of a miner that won't let you choose what pool you want to use? I use eligius exclusively and I didn't read ANYWHERE on BITMAINTECH.com that the S4 would be exclusive to pools that allowed you to set minimum difficulty. So to me, even IF I could get my S4 working, it would still be worthless, because I can't use the pool that I choose. Why am I the only one who finds this outrageous?
I can mine pretty much anywhere with them since I updated to the latest firmware + installed Ck's custom S4 cgminer build. I haven't tested eligius for a while, and while it didn't work earlier I'm confident it would now. I could test it if you're curious?
I've been mining with p2pool lately and it's working perfectly.