I have two Gelbu's, a 17" horn by Kumar and a 17" wood by Amtrak. I just measured the spines. The Kumar is a max. of .40" tapering to about .25" near the tip. The Amtrak is a max. of .40" tapering to about .20" near the tip. I don't have a postal scale and can't remember their weights. Both say "weapon" to me, but they'd probably also chop reasonably well. Neither is particularly sharp, yet.
The Amtrak Gelbu was my first HI khuk on a UBBB. I believe Bill e-mailed back "Done deal" that day in February (think it was).
Malla's look "sexier" to me. Maybe one day I can have one of those as well.
Jeff
Edit to add that while I like my GS', they don't really speak to me. On the other hand, Sirupate's, which are not much different than the GS, really trip my trigger. I need more Sirupates in my "collection". Khuks. are funny that way.
JD