Love some of the comments

Saw one on a boat which towed us in when our engine failed coming in to Cambell Town. I asked the owner about it and he said it was the best thing he had bought for his wife to get the mooring buoy - always works, but he did say it was expensive but did not mention a price. Certainly worked, better than the other type I use which you have to stab at the ring.
 
I had a patent mooring rope threading device - admittedly not the same as the OP's - donated by a friend who said "he didn't need it any more". With practice I could pick up the arm on our garden bench every time, but use it for real on a moving buoy, no way. :(

I then realised why he had got rid of it. I expect this device shown works better, but I rarely fail with just a normal short boat hook.
 
A friend had one and it looked like the mutt's nuts until I used it in a strong tide and wind blowing us off. The f@#*ing thing jammed and if I hadn't let go, I'd have swum the line ashore. Of course, it then stayed hooked onto the cleat, dangling in the water and blocking ourt approach to the only possible slot.

Seriously underwhelmed.

I've yet to find one that's worth the money. I've got a moorfast somewhere. It works great on anything that doesn't move when you prod it, which excludes most mooring buoys, and allows you to push the thing 6" past the bit you want to get a line round, which excludes most pontoon cleats, 'cos you come at them from, at best 45 degrees above the horizontal.
 
Bought one of these when our UK plastic threader clipped onto a boat hook took the plunge up at Vastervik August 2013 due to mobo wash.
On offer at e70.00-cheaper than a divorce!
Does the job, esp if only two up mooring bows to in the Baltic, threading up the stern buoy/finger pole ring warp on the way in, then the bow quay ring or horn cleat.
Even the Dutch can get it wrong and lose an ordinary boathook overboard up there!
 
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