Re: who is happy with their 4l80 converter?
Cheap with ability for WOT lockup doesn't happen.
3 disc lockup is $900 to $1000. Small diameter full billet design. The $450 converters are the single disc lockup 65 pound 13" diameter converters. You don't want your engine trying to turn that. If you go with no lockup, you will suffer in the quarter. Frank from Autoaddictions has already experimented with that.
How the converter is matched means a LOT no matter who you use.
If you do a bunch of "guessing", you get a "guess" converter. If you give them facts, dyno sheets, gear ratios, vehicle weight, tire size, turbo boost levels, etc, you will get something dead on. So don't blame Yank or PI or whatever, it comes down to giving the correct information. Just because Billy Bob has the exact same build, doesn't mean yours will behave the same. Dyno graphs mean a LOT to a converter builder. The problem can be in the tune.