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.

If you are concerned with bad roads and ride height I would stick with replacement stock supension parts. If you are on original shocks on a 2001 with 76k on the clock the original shocks haven't been doing much for you for quite a while now.