Avalon 6 is an interesting unit, but higher cost per TH and lower efficiency than the S7 (close on both though), you pretty much NEED 3cent.KWH or less electric cost to have any chance at achieving RoI on either unit.
The Avalon 6 IS aimed a bit better at the "home mining" market, though.
S7 still has no serious competition. Yet.
don't know that you are correct first off the avalon 4.1 could be down volted and under clocked..... so if the 6 can do this it may be more efficient then the s-7.
Second if the rasp pi dies you can have a backup on hand and ready for avalon for under 50 bucks
to back up the s-7 controller you need 2 s-7's as they will piggy back on to each other. In fact this is true with the first s-7 batch. No one has shown if batch 2 or 3 controllers with new firmware can do that.
Myself I have 2 s-7's but I will very likely order an avalon 6 to test it for under volt under clock.
