I have had a cheap TMARS which was good until it snapped.
It was warrantied however and I sold the replacement. I weigh 93kg in my pants so that might have been an issue.
I’m now on my 2nd HiLo… the first one crept down and was replaced under warranty.
The replacement then decided to blow an air seal which meant that it didn’t return once dropped without manual assistance.
This was fixed again under warranty (via Wiggle, took ages, required some chasing) and it has behaved on the 3 rides I have used it on since.
Would I buy another HiLo? Probably not. Would probably buy a Gravity Dropper, whilst not infinetly adjustable, the fact you can buy all the spares from CRC or direct and service the thing yourself counteracts that.
Was pondering a new frame and the choice is between one with 30.9 and one with a 27.2 and I think the GD is that well thought of I wouldn’t let the 27.2 seatpost bother me…