I've been following this project for a while and I love it. The only drawback I see is that writing maths equations is not easy. In my blog I use Mathjax, but I guess this is not possible in Bear because they want to do all the heavy processing server-side, and rendering LaTeX on server side using Mathjax is not trivial. Hopefully they'll find a solution to this issue, since I think a lot of people would then migrate their technical blogs to Bear.