150 Hours a year isn't going to do much for you professionaly. Look around. There are lots of charter jobs where air ambulance is only a part of the business you do and one is able to log more flying hours a year. (I do about 500)
I've been flying a fair amount of this stuff for five years now. Rick1128's comments are right on the mark. For me the biggest pro is a good paycheck, 24 overnights a years, and a fair amount of time getting paid to sit at home and play with the kids and squander my life force away playing around on flightinfo. The drawback is total lack of a schedule. I'm on call right now. One hour gear-up time to anywhere in the world. Nothing like those o'dark-thirty Central America trips. Even though they take their toll, it's still kind of cool to see some variety. It can be professionaly and emotionaly stimulating to take an airplane into Panama City in the middle of the night, safely retrieving a sick individual. Not everyone is capable of doing this job well, and it's a neat feeling to be able to make it happen in a challenging environment working under the auspices of bone-crushing fatigue.
And there's good stuff too. I didn't work today. Yesterday I flew a Lung team 27 minutes to harvest in AUS. 25 minutes back. I didn't have to fly on Christmas this year, and my only trip before the holidays was 5 days in Cancun from the 18th to the 22nd! Not too shaby.
In the end you have to ask yourself what's more important? Destination, journey or both. If your goal is to be an airline pilot as fast as possible and pay is no object, then go get yourself a regional job right away. For me personnally, it's the destination and the journey. I've had a lot of fun doing this and the pay has been quite livable. I've learned skills here that would have been difficult to come by at some regionals and I'm grateful for that. Flying an RJ would be a blast, but I don't want to take the pay cut. Just waiting on WN. Feel free to PM me if you have any specific questions. I assume you're talking about SB Air up in Dallas?
Take Care!