My friends who have a kitcar building business tend to stick to OMEX, unless the client insists otherwise. They say that out of the budget end of the market OMEX is the most consistant quality wise, the easiest to map consistantly and good value for money. They are somewhat anti Emerald and Megasquirt to say the least and none too keen on DTA. The proof of the pudding is that last year to my knowledge cars they had built/prepared had multiple class wins in several sprint and hillclimb events.