I noticed a speed difference going from a 33mhz 030 to a 25mhz 040. On Deluxe Music 2 the screen refreshed faster.
At the time I was also using it to connect to the internet on an old 28k modem, the internet was more useable too.
Other than those two things yeah there isn't a noticeable difference.
If you can wait there may be some backwards compatible clones (Natami is one of them) coming out... but who knows when.
If the minimig had more features I would have more interest in that.
I can't justify spending the money when you can get a Power Mac for cheap $$$.
