Having commuted to LGA/JFK and lived in base, I have to say that living in base is so much better, I would consider it a different job. That said, here is the scoop on Envoy:
Reserve rules right now need to be worked on as it is full of weird loopholes used by both pilots and crew scheduling. The minimum contractual days off is 11 and this is how all reserve lines are built. If you are taken below 11 days off, you will get return days or return day pay. I did 3 and 1/2 years of reserve (3 of it in base) and my biggest impression of it is that it is unpredictable. You never know day one whether you will get a day trip or a five day trip. Over all, staffing has been good on the FO side for the last 2 years. I virtually never flew more than 40 hours in a reserve month and had plenty where I flew less than 20.
As a reserve FO, I probably averaged 6-8 junior mans a year.
Right now there are big pros and cons for the different fleets. The EMB will give you more base options (DFW, ORD, LGA), the CRJ will lock you into ORD, and the E75 will lock you into DFW. The EMB and CRJ pay $5,000 more ($22,100 vs $17,100) than the E75 for the signing bonus.
The E75 has new hires getting hard lines off of IOE right now and there is more movement on that airplane.
Right now the lines aren't very good. Everything is 4 day trips and many lines have only 11 days off with 2 days off in between trips.
Otherwise, morale is improving and there is real movement on the seniority list. The company has said (so take this with a grain of salt) that they expect 90 upgrades a quarter next year. The upgrade time has dropped from 8 years to 5.5 years in 6 months and will likely continue to fall. The crews are generally great and the aircraft are well maintained.