We've had a ton of fun with the base game of jambo, so we were very interested in the expansions. What we read about the expansions indicated that they would be fun if you like the original game. Furthermore I read that with only expansion 1, you would have to swap out cards to keep the deck even, but with the other expansion, it would be even again.
We found that the added cards were not too bad, but not great additions either. The other mini expansions just make the game more convoluted. If you like jambo, keep it as is, the expansions won't increase the fun, it only made it slightly more frustrating.