Never used the M2 but I did try the Tein S-Tech and the H-Tech on my Altis.The S-Tech was a bit too low as I had 18x8 rims on 225/40-18F and 225/45-18R and there was no way it would drive. The H-Tech was better but with the same wheel combo I did bring out the four wheel wells approx 1/4". The pics below show the front fenders completed but the rear fenders weren't finished then. It did look original once I had done the rear.
I used them for about two years without any problem, just make sure if you intend to drive through rough road as hard as I did, use very stiff buffer rubbers on the shock shafts.

