Strengths: Quick and easy to set up (15mins max and most of that is the mat levelling off). It is great can do any type of putt you can think of. Left to right, right to left, uphill, downhill, valley and swale. Also combo's downhill left to right. The putting stand can also be set to the hight and slope as the mat.
Weaknesses: I've got the 3 meter version and it takes up a lot of room. Have to set it up in the garage and leave the car on the driveway (but is that a weakness!!).
Overall: I bought this 2nd hand from Linksputt for £150 rather than £225 and think it's one of the best things I have bought. I used it a few times and my putting has improved in leaps and bounds.