The ES Xeons are OK, but to give an example, the single core performance of my 2683 V3 was at that of an FX 8300 and the multicore ... even being a 14core 28thread chip on 2011 V3, is now beat out by my 1800X in pretty much every test I have ran.
So for $100 a 2643 v2 .. yeah not really a thing to look at. Especially considering X79 motherboards and dual LGA 2011 motherboards are insanely priced atm.
If you are looking at CPU's just steer clear of anything that's LGA 2011 really. The CPUs are cheap, but the motherboards are INSANE prices.