I used LSP this year with 19 AL controllers, 4 LE's and 2 SSR4's.
While I didn't get to sequence all the songs I wanted to do, and had a few hiccups along the way, I was generally pleased with LSP.
There are still some minor issues that came to light near the beginning of the season, and some features that could be improved, but it's definitely my choice for programming these days.
I never got to play much with Vixen, but LSP can handle all the things I need it to...