Hi guys 2 weeks ago I picked up an Auto tuner slave. it is slaved to a company called Regal tuning.
although I have been experimenting with cheap masters that's done solely for my own personal use for now as I'm not confident or experienced enough to offer that stuff to customers. I figured slave is the best route to make some capital for now so I can later invest a bit more in myself
I've got a couple questions if a couple people would be kind enough to answer.

before I offer the remaps to the public what's peoples experience with Regal tuning (based in York)? I've heard they're quite good but would appreciate peoples real would experiences good and bad if any.

is there anything I should avoid using the Auto tuner on? I've been told they can brick CAN Line cars (before 2010) any further advice would be greatly appreciated.