There are no real Pros and Cons other that he pay rate and the fact that there are only 19 E190's. The low number of aircraft makes for very little open time to use to trade for or to allow for scheduling flexibility.
The pay for Group II while flying the E190 arises from being able to bid off the airplane, and anyone can do that if just a few months, but not being able to be trained. While a person awaits training on a higher paying piece of equipment he gets paid the higher rate.
As an old US guy, I know many who loved that situation. If you were a senior block-holding F/O and were awarded captain then you got paid for a full block of time, rather than min guarantee. At US this was 85 vs. 72hrs. It was like being a senior captain on the equipment. Same pay and good schedule.