The only GBA SNES port I've actually played is Final Fantasy 5, mostly for the new job classes it adds. But I noticed a lot of the things shown on the video. The audio was tinny, even on an emulator, the graphics looked brighter, more washed out.
I have to say though, I never realized there were so many GBA SNES ports. I knew about the Mario ones and the final fantasy ones and a few others, but didn't realize there was actually so many ports done.
The GBA was a pretty cool system. At the time though, I never actually thought of it as a pocket SNES. A lot of the actual GBA games didn't look like snes games. Most of them had a totally different style to them and played differently. It never really occurred to me until later that it was kind of like a pocket SNES.