I have cgminer-3.10.0 on Fedora 19 with AntMiner. (I had to add --enable-bitfury to configure for it to compile - otherwise it would miss mcp2210.c.) It is mining at 600Mh/s, not the vaunted 1.6Gh/s, and it is barely warm (unlike the block erupters, which get quite hot in operation).
(5s):631.4M (avg):378.7Mh/s | A:349 R:9 HW:32 WU:0.0/m
Also, it is detected as USB1.1, not 2.0 (other 2.0 devices plugged into the port are detected as 2.0).
There is no official Antminer U1 support in cgminer yet, since the creators of Antminer never contacted the cgminer devs with code and/or hardware before it was released. The developers just recently received units they can develop for, and so Antminer support is likely eventually forthcoming. There are some forks of cgminer out there that have implemented an Antminer driver already though, though you'll have to look around for 'em and they're generally unsupported.
Ah, well I am impressed that with no software changes it does the work of 2 Block Erupters at less than half the power. So with a little code merging and/or waiting, it should do the work of 5 Block Erupters.