Walt Cooney put AAVSONet scope K28 through a semi-tough test recently - collecting Sloan g' and r' data on a mag 15 variable that he discovered some years ago.
Go to http://www.aavso.org/vsx/ [1] and search on VSX J064448.1+210222 scroll down to Supporting Documents to see a phase plot.
Not too bad for an 11-inch SCT on a commercial fork.
More data on similar targets is being collected as I write this....
Links:
[1] http://www.aavso.org/vsx/
[2] http://www.aavso.org/forums/variable-star-observing/aavsonet
[3] http://www.aavso.org/category/tags/k28
[4] http://www.aavso.org/category/tags/vsx-j0644481210222
