Nope but now I wish I did! I know I'm going to sound like Captain Obvious, but man, it's so much easier playing electric guitar standing up...It's much more comfortable and way more fun too!
I have short fingers, so I always thought it would too hard playing standing up. I also thought it would difficult to see the fret board, but I find, for the most part, I don't even need to look at the fret board. Good thing though, after all the years of practice and persistence, it's finally all coming together. Turns out, you can teach an old dog new tricks! Off to buy more straps! lol