5 stars
I've been using one of these on my 1x9 winter hardtail for the past two years. After a few minutes refining the alignment and cage height it works exactly as it should.
I did break one cage after about a year, but the fact that Superstar stock spares meant that, for just a few quid, it was brought back into full service in no time.
To begin with it was a little noisy in the lowest gear, but the