1. The LiveReload feature stops if you open Chrome DevTools, which I often use to debug. Unfortunately, Brackets' own tools aren't enough to match Chrome DevTools, so I have to work with the LiveReload feature turned off, which is a bummer. I really really hope they fix this.
2. We use LESS at my job, and while there are LESS autocompile plugins, working with LESS in Brackets is still not as seemless as working with CSS. However, I think that with some better plugin support and some tweaks to the current plugins, it eventually could be.
I've got to say though, Brackets has totally replaced Sublime for me as my primary editor whenever I'm working on front-end stuff. Theseus and the other Javascript debugging tools are top-notch. I recommend that any front-end developer at least give it a shot for a week or two.