The Gitzo systematic 5 series tripods are the best, IMO. I wouldn't use anything else. Really Right Stuff, at times, seems like they're out of business. Their products go out of stock for 6 months at a time sometimes. It's very strange. With Gitzo, you have a complete system that is always available.
I have an RRS BH55 that is 11 or 12 (or 13?) years old, and it still works the same as it did the very first day I received it. I can't imagine it "breaking." However, it is JUST a ball head. It's nothing special.
I tend to use my Manfrotto 229 pan/tilt head nowadays, but the best ball heads in the world are the FLM ball heads. I have the 48 and 58 variety, with Kirk clamps permanently attached with red Loctite on big 3/8 inch studs. If you've never used an FLM ball head, you need to try one before you even consider a BH55.
The FLM 48 is much smaller than the BH55, including the ball, but if you just turn the lock knob a few turns to the right, you can tell the FLM is many many times stronger than the BH55. You also have smoother control with the FLM, where the BH55 is "sticky" instead of smooth.
The FLM 58 is in another dimension. But even the best ball head in the world is still just a ball head. I now prefer pan/tilt heads and am looking towards a geared head.
If you were just asking about tripod legs, I apologize for my rant about ball heads. Good luck!