I had the PLUS Ultravid and no, it really was not updated. I had a retailer in UK look at all 5 of the Ultravids they had in stock and one here in the states looked at 4. So out of 9, plus the one I had....all were the PLUS and all had issues with the focus wheel. Leica has a problem that somehow, they cannot fix it...
It's a shame that high end optics are still struggling with mechanics such as you describe.
I recently bought a Swaro SLC and as much as I tried, I could not get over the gritty, sluggish focus wheel and not-so-smooth hinge. In addition I found silver specks of tiny metal shavings stuck to the interior of one optical barrrel. It didn't affect the view, but it soured me on the experience. I returned it and jumped on the refurbished MHG for $499. 1/3 the price. The Nikon focuser is miles ahead of the Swaro and the interior is flawless clean.