i used a hudzl case and p/c on the 440 , and a arbor-tec case on the 372XP -- and i also used their cranks, bearings , seals and even those circle clips everybody hates-- i like their cases---
i got a spare 372 short block from arbor tec -- never used it--
i also used their coils, flywheels and sparkplugs -- , carbs, intakes and mounts, oil pumps and small parts-- to be honest the only things i worry about much are their rubber stuff-- the starter on the 372XP and how long the plating will hold in the cylinders--
the MS 440 i have run for several years-- so far it has cut more wood than the ms290 box store saw i had that locked up-- i don't think the china cylinders or rings will hold up like OEM in a pro saw , but their at least as good as a typical box store saw-- that said i am still trying to wear these out-- on 50 to one mix no less-- and so far they seem to be fine--
if you take your time and check everything over -- and do a good job on assembly there is no reason to think you can't make a decent saw from a china supplied kit. you will probably find a few things that need to be corrected in the kit-- but once it is sorted they run shockingly well--