I have a rig of 6 x 2080.
The good thing is that it is worth less than the 1080ti 2 months ago, and that its maximum TDP is 210W instead of the 250W of the 1080ti, matching performance, which will eventually improve as the mining software does.
I thought the 2080 was barely faster than the 1080 ti and near $1k? I've seen 1080 ti's going for near $750, no? I'm not sure the new cards are worth buying with AMD coming out with the 670/680 series for much less money.