Solidly-built; BB spacers give good adjustability for chain-line; guide can be loosened to slide up and down to suit ring size. Bit of a faff to set up, but then all BB-mounted guides are. I've used this 38T and 32T single-ring setup and on balance it works brilliantly, and at this price it's a bargain.
2 things to note though:
1) It looks like it's designed for DH single-ring, so using a th