How's it work for others who have been using them in production?
I'm running this for a while now with good results:
bfgminer version 3.99.0 - Started: [2014-04-04 21:06:45] - [ 0 days 12:18:32]
[M]anage devices [P]ool management [S]ettings [D]isplay options [H]elp [Q]uit
Connected to x diff 1m with stratum as user x
Block: ...b53afe02 #544104 Diff:5.75k (41.13Gh/s) Started: [09:24:58]
ST:102 F:0 NB:305 AS:0 BW:[ 3/ 0kB/s] E:0.00 I:11.33mBTC/hr BS:196
0 | 6.95/ 7.01/ 6.21Mh/s | A:26713 R:2704+0(8.6%) HW:17/none
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GSD 0: | 338.6/348.9/264.6kh/s | A: 1138 R: 119+0(none) HW: 0/none
GSD 1: | 346.6/350.5/323.2kh/s | A: 1388 R: 128+0(none) HW: 0/none
GSD 2: | 344.4/351.1/320.7kh/s | A: 1383 R: 135+0(none) HW: 0/none
GSD 3: | 339.4/349.2/283.3kh/s | A: 1207 R: 111+0(none) HW: 0/none
GSD 4: | 338.4/350.2/300.9kh/s | A: 1303 R: 147+0(none) HW: 0/none
GSD 5: | 345.4/350.6/316.2kh/s | A: 1359 R: 155+0(none) HW: 0/none
GSD 6: | 345.4/351.0/330.8kh/s | A: 1431 R: 142+0(none) HW: 0/none
GSD 7: | 356.6/350.8/334.8kh/s | A: 1435 R: 132+0(none) HW: 0/none
GSD 8: | 343.9/350.6/329.5kh/s | A: 1415 R: 122+0(none) HW: 0/none
GSD 9: | 349.7/350.1/303.3kh/s | A: 1314 R: 116+0(none) HW: 0/none
GSD10: | 347.2/349.6/295.9kh/s | A: 1272 R: 143+0(none) HW: 0/none
GSD11: | 357.0/350.5/307.9kh/s | A: 1332 R: 144+0(none) HW:12/none
GSD12: | 344.4/348.9/271.1kh/s | A: 1167 R: 116+0(none) HW: 0/none
GSD13: | 339.6/350.2/318.7kh/s | A: 1358 R: 130+0(none) HW: 0/none
GSD14: | 352.7/350.3/310.1kh/s | A: 1330 R: 164+0(none) HW: 0/none
GSD15: | 344.9/350.5/317.0kh/s | A: 1372 R: 148+0(none) HW: 0/none
GSD16: | 347.0/350.2/312.9kh/s | A: 1342 R: 130+0(none) HW: 1/none
GSD17: | 342.5/351.2/335.5kh/s | A: 1440 R: 156+0(none) HW: 0/none
GSD18: | 344.6/350.6/316.4kh/s | A: 1350 R: 129+0(none) HW: 4/none
GSD19: | 351.0/351.1/320.8kh/s | A: 1387 R: 138+0(none) HW: 0/none
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This is on p2pool so rejects are a bit high. Only wish for now is individual freq settings.
Right now it's running gridseed-support-clean branche. With the default branche the hashrates looked higher (but maybe it is more accurate now?).