I think as long as you take care of it a T8's its pretty much the Ford Focus of moderators, nothing special but does the job. Plenty of professional stalkers firing hundreds and hundreds of rounds a year with no complaints. I used to just take mine off the rifle and wing it in the cupboard until I noticed the build up of rust. Now I blow though the thing to clear out any corrosive gases, squirt of WD40 and left on the harth to dry out a little, and always take the neoprene covers of when not in use.
I also have a CNN 4 and a Maxim, the Maxim is new so I'll reserve judgement but the CNN4 is not the easiest to clean after a while and like Marshall on this site I've noticed a lot of eroded metal and corrosion around the threads and ports - Its probably had about 200 rounds through it. I won't hold out on it lasting as long as the T8.