Should you take advantage of the WOW Air deal to KEF/CPH/LGW?

Currently, WOW Air is having a fantastic sale from Washington IAD/Boston BOS to Reykjavik KEF/Copenhagen CPH/London LGW. These fares go from $99 one-way, to about $150. They are a low cost carrier and charge quite a few fees, but if you can pack light, it’s a great deal. Note: book on the WOW Air USA site, not the UK site, which adds additional taxes.