No idea what the difference might be between the Rifle Basix MAR-1 and MAR-917 trigger upgrade kits other than fit for two different style triggers, but the MAR-1 I installed on my 17VS as soon as I bought it almost 7 years ago has never missed a beat, passes a drop test and has never failed despite being set for a light pull, and I have had zero problems with the safety.
I know some folks that did the cheap Pentel pencil spring mod on the Marlin 17's can't say that. The price of the RB is cheap peace of mind IMO.
I was "in the loop" then - I'm not now, so FWIW...