As someone who spent the last half of his career running small companies, I am obviously a fan. That said, for something like a gas grill, they would have to have designed something very different or unusual, or have some amazingly solid parts for me to give up the security of dealing with a company that has sold millions of grills and has had decades modifying them and servicing them. I'm not sure I see, in the pictures or the descriptions on the Blaze site, something that would make me want to take a chance on them.
For the ultimate negative, showing what can happen when dealing with a small outfit, check out the recent, long thread in this forum about the agony of dealing with a Kickstarter-funded company making temperature measuring devices. It's been a real headache for all the customers. Blaze is obviously further along, but it's something to think about.
I just skimmed the reviews on
Amazon for three of their products. My general sense is that they use really good materials, but that the actual design of the thing (burner size & placement; flavorizer bars; heat chamber size; etc.) is typical of an early engineering prototype rather than a refined product that is in its twentieth design iteration. Also, there seemed to be a theme of poor customer service. My experience with small companies is that they usually operate on the two extreme ends of the customer service spectrum: they are either willing to do anything and everything to satisfy their customers so that they get the word of mouth advertising, or they only know how to make and ship the product, but don't really understand how important customer relationships can be.