Anybody Ever Use a Groove Tubes GT55?

[Bob's Mods]

Is there anyone who has had any experience with the Groove Tubes GT55 mic sold by GC? Is it any better or worse than any other mic you've used? Has anyone ever compared one to an NT1000?
They don't seem to get much attention and don't seem to be a big seller. Groove Tubes does have a good reputation.

thanks,
Bob