I've had a set of their Stainless Steel Superbrights on my Fender Jaguar, for several months (I play this bass about once or twice per month). I have basically only ever puts stainless steel strings, on this bass. No noticeable fretwear. and I only used rotos, for a couple of years.
Due to the balanced tension and flexibility, these are easier to play than a lot of steels. They also are not quite as rough, as some others, when new. and after a bit of time, feel smooth and easy for slides and fast fretting. The MM strings are, I believe, a little higher tension. But the overall feel and playability, should be very similar. The tone is of course, different.
If you are interested in the MM sound, i would not hesitate to get these strings. The balanced tension will make your bass setup better and you will play better. Your frets will love you.