If the burl is colored (blue, green, etc.), it has been stabilized and is essentially a wood-based micarta. (Not technically a micarta, but close enough). In which case, no worries.
If it is natural colored, it may or may not be stabilized - check with your dealer or Mike Stewart to be sure. Either way, Mike wouldn't use it if he wasn't sure it would stand up to real use, and they're fully guaranteed. So no worries.
I have a Desert Ironwood burled B-1 (not stabilized), and I just use it like a micarta handled knife, and have had no issues with it.
Bottom line: use it, no worries! :thumbup: