I, too, purchased a Mitchell ****** for my Cabriolet. The reason was is that my wife could not get the non-syncro shifting thing down pat.
I bought the 15% low and second and the ratios are great. High is the same, 1:1.
I have driven non-syncro for 50 years and I kinda miss the mind-game, if you will, of driving the original set-up smoothly. It was a challange to do it correctly and I liked the challange.
The new set-up is a breeze. No challenge. Get in and drive. I do have to admit that on a recent Palos Verdes CA road rallye, the syncros made it easy in the hills and the gear ratios helped a lot.
It was a no brainer to install. Straight removal and installation. Easy.
All in all, I say go for it!
Dick Wyckoff