I've had some okay experiences with Adorama, though one dude there was just annoying in selling me filters I didn't want, and then sending me filters with fingerprints all over them. Just annoying.
B&H has always delivered what I ordered, and once took back a couple of Sigma 150mm Macro lenses and extenders with no other reason necessary than I just didn't like how they felt.
Calumet has been okay in the past too, though their website was a pain to figure out.
B&H is my default, though Adorama is fine with me. I liked the refurbed 100-400 delivery just fine. No hassles, just showed up with the filter I ordered.