I had the MT500 and true to form it fell apart at the seams
In it's defence though it is extremely hard wearing and can sustain scuffs and scrapes and a reasonable fall.
I then went for the Alp X and yes the difference in waterproofing, breathability and weight is poles apart from the MT500. You can also fold it up small and stow it in your pack. Down side is that it will tear on a fall but you can get Goretex repairs at a couple of places for between £30 and £50.
I ran my Alp X into the ground. Couldn't get the stink out and the waterproofing to take again. Never one to miss a bargain I bought a Mavic coat as a replacement for a bloody good price and because it had some yellow flashes to match one of my bikes .... I think I look look good but I'm nowhere near as dry or warm as I was in the Alp X...Lesson learnt !!!
I think you know what to do.