I'd much rather have two decent panels than those six cheap TNs. Especially considering the poor viewing angles you'd end up with that setup. The colour degradation is going to be absolutely awful.
It depends on the work you're doing. If he's not an artist, he almost certainly doesn't care.
I'm an academic, so it is mostly black-and-white and some data visualization.
Have you ever tried to write code on a TN panel? I ordered a Dell 22" UltraSharp with a TN, and sent it back the next day for the 24" that has the VA panel (and is 2.5x the price).
Same, had my 24" TN for 2 days before returning it for a HP IPS panel for 2.5x the price — so glad I did. Even at the optimal viewing angle, colours were fundamentally lighter at the bottom (and darker at the top), making text in the bottom 1/3rd straining on the eyes. Never again, given a budget, I'd much rather to compromise on the computer hardware than the monitor.