When it was first offered in the 1980s one of the problems of this conversion was a poorly designed bracket with the inner end tucking under the spring arch body mount and potentially being rocked into the body on droop or when jacked. Being able to fit longer brackets when the body is off helps.
Now with less likelihood of being able to get lever arm dampers rebuilt and with ongoing improvement in adjustability and ability to set different rates for bump and droop there are ride advantages.
I have on occasion used Spax, but far prefer Koni.
Rotoflex worked, both on the Vitesse and on other installs like the Lotus Elan, but they do tend to ‘wind up’ under power and give potentially too much flex in drive transmission. Also for a long time there were poorly made ones on the market that would separate rubber from metal plates quite quickly. This properly executed CV conversions are good if you are not going for originality.
If a car has had a CV conversion you need to check what type it was and whether any bearing changes were made in the suspension upright. Ultimately if a car has an original diff and mounting positions an original full Rotoflex set up can be retrofitted.
