The Mast Mate set-up looks very convenient but it apparently has no secondary safety line. Going up on just one halyard would make me very uneasy. Do you tie off somewhere else as a safety.
We bought a used (very little) Mast Mate ....
Mast Mate Home
....but haven't used it yet, but will the next time we are at the boat.
I'll pull the Mast Mate up with the main halyard but will also wear a safety harness my wife made (Sailrite) and....
.... will probably use a line from it to the main halyard, as shown above, with either a prusik knot or friction device as a safety. I can slide it up or down the halyard as I ascend or descend.
The first time up I'm putting in another block up there and will then also have a line thru it to me and to the wife below. She is the backup safety to the prusik loop I'll be using. I don't want to put her in the position of number one safety. Also once up I could unclip from that line and use it along with her to raise tools/parts up to me.
One negative to the Mast Mate on the water is that you have to drop the main out of the track to use it, but I've read of some that have had luck leaving the main in the track and not using the track but pulling the Mast Mate up next to the mast free standing and then tying it off to the mast as you go up to keep it next to the mast. It needs to be tied off below next to the mast to do this.
Also the Mast Mate we got came with a belt kind of like a lineman's belt that you can keep around the mast as you ascend and descend. It also has a tool pouch.
I have a couple permanent steps that will be placed near the top of the mast to stand on while up there and can lean back on the belt or put a simple chair on the line my wife will control.
Another negative to the Mast Mate is that if you wanted to deal with a 70 foot mast you would have to get one of the appropriate length.
I had looked at all the other options that have been mentioned in the other posts. Being close to 70, but in good shape, we felt the Mast Mate would probably be the best solution for me/us. I guess I'll know a few months from now,
Our 37 Endeavour --- Our 26 MacGregor --- Trips With Both