I ordered one of these from BMS battery for bulk charging my 20S4P lipo:http://www.bmsbattery.com/alloy-shell/29-alloy-shell-1200w-lifepo4li-ionlead-acid-battery-ev-charger.html
I ordered it on 19 October, and it arrived today on 3 November. It was very well packaged, was delivered by DHL, and I was emailed a tracking number etc. from BMS promptly, communication on their end was perfect. With delivery the total cost was (Aus)$192.87
Here it is in the flesh:
To give it some scale, here it is with a Lyen 12 Fet:
It came with Anderson SB50s, which I swapped for PP75s as that is what I had on my battery lines. It didn't come with a power lead, but it is a standard jug lead, and I just used another lead from an old charger.
I set it up to charge my 20S pack, and it worked perfectly. Charged at 11amps, and final charge was spot on.
I had been hoping that the voltage would be adjustable externally, but the display at the front shows volts and amps, with a switch that switches between the two. I realise I could install my own external pot for trimming the voltage, and I may do this as I wouldn't mind turning the final voltage down a bit for prolonging battery life.
Can't say a bad thing about it so far, but we will see how it holds up over time. But for those looking for an out of the box bulk charging solution it is a pretty good option.