Dominator weak spots can include the following;
If the original exhaust is still fitted,check for rot from about midway along,backwards especially where the pipes sit under the rear mudguard and the silencers.
If the running is a bit lumpy or does'nt pick up smoothly when revved,suspect the carb diaphram is shot...and the later ones you're looking at had one-piece diaphram/slides which are a bit pricey.
Camshaft wear (case-hardening pitting specifically) can rear it's ugly head but really depends on frequency of oil changes.
If you get a bit of clutch slip,try changing the oil for proper motorcycle oil first before renewing the clutch springs.Car oil has additives that don't help big single clutches.Age-softened springs are usually the cause of slip on the big RFVC motors(i've yet to find plates worn...).
Gearbox is normally bullet-proof on the RFVC,except if the final drive chain has come off and bent the gearchange shaft.NOTE;there are 3 different types of spline drive on the final drive sprocket shaft.Be sure to get the correct one(2 are very,very similar with barely 0.5mm difference in shaft size).
Standard seat is the most horribly uncomfortable contraption Honda have ever thought of!!
Other than that,they're cheap and a good one will do the trick.
Just going for a short ride on my bike....