I've been workin with this obsidian quite a bit lately, and I really have been enjoyin it! I know it doesn't present alot of the challenges that chert and flint do, but I feel like I'm developing a good feel for the angles and pressures. I still have a little burlington, but it's not very good quality and they are smaller pieces. SOOO, until I get some better stone, this will have to keep me busy.