I think that it was the first genuinely good dyno that people over here started commonly seeing, so it became the accepted standard by default. And that will now be hard for others to compete against, even though mainline etc are just as good a product im sure.

Im sure if mainline had some big high profile sales early on, it would be them instead by now that everyone viewed as the standard.

Interestingly, dyno dynamics have just launched a new "dynotech" rolling road which is a 2wd offering thats a lot cheaper than the normal 2wd one they do.

Current prices are:
Dynotech 2wd = 25K + VAT
Normal 2wd = 41K + VAT
Normal 4wd = 70.5K + VAT


The dynotech looks a genuinely good option, very similar specs but a lot cheaper, includes same software and even the same retarder as its big brother.
downside is it cant be upgraded to 4wd.
Will still do 1200bhp for power runs, and 600bhp for held state though, so still a very powerful bit of kit.

For what my mate is after, I'd say the dynotech looks like a very affordable way to get the dyno dynamics name on board to rent the rollers out (he's interested in offering a dyno facility rather than mapping services), even if it does cut out some potential customers by being on 2wd, not sure if he'll want that compromise or not.

Would be a good way to test the water, before deciding on making the larger investment!