Just thought I’d weigh in with the results of an experiment I tried lately.
I bought a YouCups ‘THROUGH’ from aliexpress.
It’s a cheap version of the Fleshlight Quickshot. I bought the blue ‘soft’ version, which is not as soft as I would expect. It could be a whole lot softer and would still work, at least for me. Not sure I’d go for the hard or extra hard versions based on what I got for soft.
I’ve never seen a quickshot in real life, so I can’t compare, but size-wise I think the ‘through’ is more targeted towards an asian market. I would say I’m around average girth in the western world and it works just fine for me, but when I’m particularly engorged it is quite tight and starts to feel a little like a cock ring. Extra lube may help but people of larger girth might find it uncomfortable (and this is the ‘soft’ edition).
In terms of how it works as a sleeve for the handy… Mostly fine for me - I’m a bit too long for the standard handy sleeve, so something open-ended is more comfortable and doesn’t stretch out and pull on the head when at the base.
I think the outside of the quickshot is textured which might help with the strap. The outside of the ‘through’ is smooth, so it’s tricky to get the tightness of the strap so that it doesn’t slip off. The softer material of the quickshot sleeve might flare outwards slightly during use, which might also help it stay put but I’m not sure. I think some additions to the case of the ‘through’ would definitely help here.
Finally, because it’s open-ended, there’s the problem of mess. Not sure what to suggest there. Be careful about what position you’re in/angle you’re at when you start getting close.
I’m happy enough with it, and it didn’t break the bank.