To the OP... if you mean the quality of my beer improved? Can't say it has. Went with conicals because I wanted to bulk ferment and use temp controlled upright freezers. If there is an improvement, it is that I can hold temperatures lower and more stable than my old system - that has nothing to do with the conical though. I also do a sealed transfer when kegging removing some of my fears of oxidation.
Compared to buckets or carboys, conicals are a bit more difficult to handle and clean. You must make sure to remove and sanitize the parts (gaskets, fittings, valves) - and occasionally need to deal with beer stone. More parts mean more possible points of failure such as a leak. And sampling, while convenient, is also a possible point of contamination if you don't keep everything clean and sanitary (true of anything). They also sort of commit you to large batches if you go to 10 or 1/2 barrel conicals.
I still keep my Speidels and Better Bottles handy for smaller or split batches.