I have had an SC600 for a while (bought it immediately after the addition of the lanyard hole). It's a nice pure white (almost creamy) same as my Quark X. My Callies Kustoms slip easily into the SC600.
So I ordered a H600 because I liked the SC600 so much... I'm not much of a tint diva, but this thing is blue/purple! Reminds me of the first XML drop-ins that came out with the T4 binned early emitters that were angry purple. When shown side-by-side with my SC600 it makes the SC600 appear neutral tinted. On top of that, one of my Callies Kustoms stops about halfway in and the other is a tight fit.
Are these experiences common with the H600 or did I get two flukes in one? If these are not common problems (tint and tight tube) then I will probably ask for an exchange with the dealer. If these are common problems, then I'll probably just return the thing. I'm hoping to get what the SC600 is, but in headlamp format.