I got the glass "pill bottles" yesterday - gosh, seriously tasty. I was expecting them to play pretty much like my Dunlop glass slide but "hey, I look like Duane Allman now..."
Nope, they're definitely different, and more effective. It's kind of lighter, and the glass feels sort of "harder" and brighter on the strings (I'm sure it's not, just feels it). And it just SINGS. I've just been playing it at loud volume upstairs - it's magnificent. I did a lot of playing through the THR10C in the living room yesterday, that was good. But the THR100 unleashed a bit is somthing else.
The brass tube is still cute, but I think these clear glass bottles are my "go to" electric slides for the moment.
I'm trying to figure out whether it would do anything for you. I suspect not, at the moment, remembering what it was like when I started trying to get some slide going - the glass one I first bought was kind of bamboozling me, then my drummer "borrowed" it for a day and took it to the engineers in the Physics department as a size guide. He came back with the brass tube I've been using ever since.
Funnily enough, I DO remember it being easier playing slide live in front of an audience, though!

- crumbs that does take me back. I wasn't convinced I was getting anywhere, but the drummer liked it, and then I seemed to get by live. I think it's a little bit to do with the volume, the backing you're playing to tends to keep you honest (in tune!), and you basically have to go for the notes you know how to play! The muting, the tone, everything sort of comes by instinct. Then you spend months trying to get that same sound practicing in the bedsit!!
That's partly why I went up to the "studio" and cranked the big amp just now. SG in standard tuning, and quite a low action for me, with a 70s/80s Marshall sound - it's pretty darn good.
Going to try a Tele now.
I think I might have to set one of the Teles to G. It'll probably be one of the two with Blackguards in.