I've got ROW M030 suspension on my base boxster. And the car is Malaysian registered and is based in Kuala Lumpur. The roads here are probably as bad or even worse than in Montreal. But, the M030 does pretty ok on these roads, in fact it takes the bad roads better than my BMW E90 on standard suspension.
It's the lowered height that catches me out sometimes - I've got just enough clearance to go down my driveway and have to be careful on steep decents. Also with 2 on-board, I sometimes lightly catch the road hump. Not too bad, just need some caution.