Do a search. There are a LOT of threads on this. It's a personal preference...but I can say that cleaning isn't an issue if you have a keg cleaner system and do several kegs at a time.
When fermenting, take out all diptubes and posts and set them aside. Put small stoppers in the diptube holes. Remove the pressure relief valve and insert blowoff. Fermcap will keep the krausen down. When ready to transfer, reinsert diptubes and transfer to a new keg with a liquid jumper. Use swivel fittings on it and you can runoff the first bit of yeast and reconnect to finish transferring.
It really is a slick system...and these fermenters can go back to being kegs if you need the extra capacity. Can't do that with a carboy or bucket. They also retain their value indefinitely....you can sell them for what you paid.