Yeah 100% agree, expensive doesn't mean best.
I've heard good things about Unicorn, however a tune plus DSG map is still close to £1,000. If you factor in an additional tune for Stage 2, then Racingline can save some money. However Stage 3 gets very expensive still, even with the OEM+ software upgrade being free.
The one thing for RL and Revo, is they'll never give headline figures. But for me it was about piece of mind reliability wise.
One thing I will say though, the back street garages offering tunes for £150 are just asking for trouble haha.
What about companies like bluefin? They charge around £400 for a Stage 1 tune. Would you recommend steering clear of companies like this?