I'll just give it a try and see what happens Nik
The L-Pro is similar to the IDAS D2 and other broadband filters and probably is best for smaller galaxies from the 'burbs.
I tried the L-Enhance on the SMC and it worked well and I'm guessing it might be interesting to try on M31 and M33: with their large apparent size there might be enough visible star forming regions to make an interesting image - or not