Mine was dyno'd when the install was done - all part of the package. They used a custom tune (supplied by chipit) to get the characteristics I want. I've had a wiring problem with mine, but that was an annoyance more than anything else.
Personally, I'm not a big believer in "seat of the pants dyno". Need to analyse exhaust gasses, rolling road data etc in order to determine the best configuration for that particular engine and user requirements.
But that's just me. Everyone is different.
Some will say "why mess around with a cheap chip - go the best" and then not pay for dyno work to make sure all is correct.
Mine was supplied, dyno'd, and the cost was $950. Three things tho - that was here in Tassie - labour and services can be cheap down here compared to the mainland. 2, they had only just taken on dealing with chipit and wanted some feedback so supplied me the chip at the right price, and 3 - it was 3 years ago.