I've owned plenty of Filters & some of those are listed here' I completely agree with the analogy that they react very differently with different instruments'
I have settled on an original ( & very desirable as they are no longer in production) 3 Leaf GR2 simply because of its, ease of usage Great Squelchy envelopes can be dialed in very quickly & it is an excellent sounding filter' unlike some of the 'way to quacky' laser beam effected boxes available now.