I have recently been using my ATN Topclimber a lot for some jobs at the top of my mast. I would be happy to hear of your experiences and some of your tips on using this solo mast climbing piece of equipment.
Here are some points / tips of mine:
1) I was not happy with the supplied Topclimber harness, have substituted it for a Helly Hansen bosun chair with shoulder straps, more comfortable seat as well as a side pocket and a tool holder.
2) I was also not at all happy with the supplied chain on the upper section, it would only allow me to raise myself by 15cm with each stand-up! As the maximum amount you can actually raise yourself on the halyard is the height your legs can produce you want the top chain / strap to be of that length. I am using a double rope adjusted to my situation, resulting in that I can now raise now by 30 - 40cm with every stand-up.
3) I always wear long trousers - the mast can be dirty and has sharp points. Also make sure you have knee pockets with velcro closure, typically side pockets in your trousers could well be unaccessable in the seat / bosun chair. And don't forget to put a hanky in that knee pocket - I speak of experience!
4) When I reach the top of my mast and the top rope brake is at its highest position on the halyard I am still too low to reach the top of the mast. I have added another short rope which is affixed to the shackle of the top rope brake and which, after I stand up and attach it securely to my my bosun chain, allows me to raise myself even further.
5) My cat has two fixed backstays and a topping lift all conversing at the top of the mast. To gain some space up there I swing the boom to one side, another possibility would of course be to loosen the topping lift.
6) In order not to swing around the mast when climbing / lowering yourself and to stay close to the mast I attach a short line from my bosun chain to the highest of my batten cars and pull it up and down with me.
7) I am not too happy with the foot loops, they seem to slip off my shoes a lot. Have tried tying them around my ankles with string, changed shoes - still not happy. Climbing boots with a rough sole could be an answer ?!
8) A WARNING: The Topclimber comes with two rope brake fittings through which one threads the halyard rope. The bottom rope securing bolt of these rope brakes have a bolt which is only pushed into place and is NOT secured by a split pin - I noticed that my bottom rope brake's bolt was loose 5m up the mast!