Large RPM and Vacuum drop when shifting from park to gear

That's kinda what I like about it....the Mopar system uses a much better design hinge point - bronze bushings that are bigger and fitted more closely. But that's also its downfall...they are a lot more prone to getting sticky or completely stuck. It's like the old story of the AR-15 versus the AK47...the AR-15 is much better built but the AK47 will keep firing, even full of sand, due to the sloppiness.

Then, the MSD/GM design is much, much faster and easier to access for tuning. Plus, they offer a variety of springs which Mopar really doesn't. Finally, the MSD/GM also uses bushings which allow you to further define the total advance. With the Mopar setup, it's filing and filling time.

I've not had any issue with repeatability...again, I think the sloppiness works well to not allow stickiness.