The only irritation I have with mine (HiLo) is that it squeaks the first time it’s dropped/lifted. This is down to the tightness of the seal.
I had to apply some threadlock to the bolt that holds the lever as it worked its way loose over the first couple of rides. No issues since.
There is a tiny amount of rotational play from where the top assembly is fitted to the post, but it was exactly the same from new and it’s not apparent when riding.
The seatclamp is fine. It did need some grease on the threads initially, in order to get the bolt tight enough, but mine has held tight since.
Mine has had a protective boot – made from a Lizard Skins inverted fork boot – fitted from new. The seal is otherwise a trap for everything that the rear wheel throws at it.