I'm an experienced miniatures gamer and I'm always interested in new rules systems and curious about 'universal' systems in particular. One of the nice things about PDF products you can buy at little risk to the bank. Sometimes a good thing when you're a miniatures gamer... :-)
On the negative side, beyond the need for more examples/genres (very basic fantasy and sci-fi settings are given), is better vehicle rules, more weapons examples, and perhaps a better way to work out costing for grenades (minor or major issue, depending on your genre!). And maybe some equipment? Again, players are likely to make up stuff for all of this, but it would be nice to get more in the book. In some cases you could end up doing so much work yourself the value of the rulebook seems to diminish.
Perhaps because of this last point, BB could probably stand to be a couple bucks less in its' current incarnation... sounds cheap I know, but because it's e-publication they could easily have added more Stuff :-) Perhaps the core rules could've been free (like Microtactix' Simply Roleplaying rules) and specific in-depth genre packs been purchased products?
On the positive, the core ideas and the gaming system has real potential. It's easy to grasp (good for beginners or casual miniature gamers), but there seems more to the system for more experienced gamers who like to tinker, create and add-on. Don't expect the world from the rules, but there is something to be liked about the system. Try it if you like to experiment and add stuff.
In all not bad. Nothing spectacular, but likeable! It has potential - hopefully it'll be supported and added-to in the future.