Pros
1) The team is great, everyone is very special, very dedicated, full of passion. It's a great environment to work. 2) The work itself is mostly very challenging. We're operating in very new / cutting edge territory, and half the time we have to figure out how to do something for the first time. It's thrilling. It's not easy though - you have to want that kind of environment. 3) Customers are legitimate companies - big brand name blue chip German car companies, among others. 4) Investors seem to be quite reputable, which speaks for itself.
Cons
1) I guess it's not uncommon in early stage software companies, but despite all the diversity that there is, there are not enough women. 2) Also, sometimes discussions are 'too thorough' - the culture is to get everyone on the same page, which sometimes leads to lengthy discussions. This is not a problem but again, it's not for everyone.