Is a bulli a1 worth it

trying to find out if a bulli a1 rebuildable is worth the learning curve or an over priced paper weight. Don't need more but want more toys to play with. I already have tried a bunch and been happy with 808's and 306 tried the ego tank didnt go well and the carts loved them 510 carto sucked 901 atty was alright so ya been out there a ways. the problem with ego's is they are over priced and over rated I think