I started using it back in version 8 and currently use version 11. I like it. I also occasionally use Adobe Illustrator and Photoshop to make titles for use with Vegas Pro.
Another Vegas/Vegas Pro user here, dating back to Vegas 4. Skipped a couple of versions out of financial considerations, and haven’t upgraded to 13 because it’s doubtful that I’ll ever produce another product of the type that made ‘keeping up’ with the latest version cost-effective. VP 12 works well for my needs at this time.
Sad that it has to be a $ decision, but there’s only so much to go around and a lot of competition for its use. I love Vegas, the first editor to emphasize a format-agnostic approach to the timeline...