I have 10 x 1.25" astronomic filters, 3 for visual (OIII, CLS and Hb) and 7 for CCD (Ha, OIII, SII, L,R,G,B all parfocal). For visual I use the CLS most as it does a good job of increasing contrast on a large number of objects in this light polluted city. I rarely use the nebula filters (OIII and Hb) as they offer a limited gain due to the fact that they cut most of the light (I use a 10 inch scope) but have found the Ha ccd useful even in visual observing. They are good quality filters with the single drawback being the retaining ring which does not have cutouts to allow you to screw down the filter easily when it comes loose (often) and I have managed to scratch the Ha when attempting to do just that (hard to focus a ccd when the filter is flopping about). I believe unless you have access to a very dark site and own a large scope, the nebula filters are not good value for money as they will see little use. I have not had any experience with the bintel filters but will be upgrading the CCD filters to 2" (chips are getting bigger and cheaper
) in the near future and will again buy astronomik.
Ciao Mark