I didn't get the CLS for 2 reasons:
1) It is harsh and you lose reflection nebulosity in a big way
2) I've been planning to do my photography from a dark sky site so something that dimmed stars a bit relative to nebulosity would still be kinda nice.
In practice I haven't escaped my back yard yet, but the Hutech IDAS filter I have and use in all my shots seems to do a fairly good job. I still get gradients from light pollution but I've gotten fairly good at processing those out now. As always your mileage may vary with usage.
EDIT: I should add this this thread of mine has image of the Lagoon and Trifid with 24 mins and 1 1/2 hour respectively exposure time with the IDAS filter. I will do a side-by-side, with and without filter, of the M42/Running Man area when I get a chance.
http://www.iceinspace.com.au/forum/s...d.php?t=126663