Great value if purchased in the US. I had to pay £12.50 duty in the UK and on top of that, it did not fit my Bosch GCM 10 SD mitre saw because, when fitted, it didn't fully clamp down on the saw blade due to the slightly raised spacer on the spindle. I had to take the guide to a machine shop and get them to take a couple of mm off the inner inside surface of the which then sat over the spindle spacer and allowed the outer surface of the guide to clamp down on the blade. Another £10 spent. So all in all it cost me an extra £22.50.
I've now got it working and it's just fine but worked out pretty expensive in the end. I just hope it lasts.