CG-5 vs. GP-DX

How much better is the Vixen GP-DX than the older style CG-5 mounts
w/ball bearings? I have the CG-5 w/wooden tripod and while it is
stable enough for my 4" f/6.2 apo, I find the backlash with tracking
annoying. Movements and actual tracking are pretty good. Also, there
is the annoying shake of the clock drive at high power. Is the GP-DX
worth the extra 3X the cost? A GM8 is another possibility but even
more costly and heavier.

Thanks,
Eddie