Yes they are fine. Use the search facility on here. It is a useful resource. Here is a recent thread...
Try to have an overnight in Rejkavik
While I've never done it, most of my colleagues on the east coast say the train from Boston to New York is more convenient than flying as it drops you right downtown. Might want to ask that one on the Boston or New York forums before you buy a flight. It's not far and those are some quite busy airports with a lot of delays.
Orlando is right, bring a sandwich or some other non-smelly food. I've flown IcelandAir from Bos to CDG a couple of times when my travel budget wasn't what I'd have liked. While they're a no frills airline, they'll get you to the US and home again safely.
Have flown Icelandair round-trip twice from Seattle to LHR and to RKV, once economy and once E+ . Both fine but if you can afford it the E+ is well worth while. Much more comfortable seats, free food (the same as you would purchase in E.) and access to the lounges in SEA/LHR/RKV. The latter is quite a bonus.
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