At least 7" of the pouch rear is hard attached to the belt.
There will always be a wee bit of movement; this I think is better than most.
Plus you can chop and change primary pouches but leave waterbottle and utility alone.
My set has lasted 6 years now ,the last two years of it's life has been gaying around with the cadets but the first 2 years of it's cycle was with proper use whilst still serving in the Infantry and I found it far better to the issue stuff I had been using previously.
I have to be honest I am not convinced by the Molle kit.,it seems to be very good for attaching to compatible armour and plate carriers etc I am sure.
But is it durable enough for belt kit ? I don't know as I haven't used it as belt kit but I suspect maybe not.
As for expensive ? I think I paid about 125 sheckles for it back then so I would imagine it has gone up in price
Have a look at 1157 Tactical. All kit is hand made in UK by one person and can be specified in any configuration i.e. Inf, Medic etc
I've owned a Troops rig and seen Dragon Supplies kit and in my mind this is as good if not better. The owner is a serving army equipment repairer and uses materials better than those mentioned and better than issue!
He's also just started making Multicam kit... I've used his kit for years and had no issues. As I said the best thing is he will make all kit to suit exactly what you need.