I don't have any experience with the Shamwari. Lots of experience with many Thorburn models. If I can assist further, let me know. I can say, with a good amount of confidence (not knowing you but knowing Thorburns) that if you get a Thorburn, chances are good that you'll be extreeeemely happy with it.
I sent him an email about ordering an L51, if you have any leads on any let me know.
