I was happy to see a longer focal length guide scope with a focuser so I bought the 350. Now that I have had it for a while I've noted couple of issues with it. First, the OTA seems appropriate for the price point. However, with a focal length of 350, this scope should have a fine focus knob. I found it hard to get it into focus with the focuser. As a result, I thought that maybe their AAF would make it easier and also allow me focus my guide scope remotely so I bought one. This where the problem comes into play. Their installation instruction state that you need to remove both focus knobs to install the AAF. When I did this, one of the bearings and focuser rod fell out and when I reinserted the rod, the other bearing came out. I tried to press fit the bearings back in but the tolerances are too loose and so they just come out again. As a result, I had to carefully superglue them in place (being careful not to get glue into the bearings) which has worked so far. The other issue with removing the knobs is that you can line up the hole rotationally but I had a hard time getting to the set screw on the focus shaft axis because the set screws are at the lateral edge of the accesses hole. A larger access hole would be helpful.