I have used FUGAWI for ten years - I personally love it and do not work for the company.
I was going to ask a similar question, but thought I would share what I have been using.
OK - I use MapTech BSB charts and NDI charts and find they work just fine. Have used them in eastern Canada and all up and down the coast of Maine.
I also use ENC (S-57) charts and they work good too.
So - here is where we wait and see what others recommend.
If you get an AIS receiver (about $200.00) FUGAWI's ENC version works great and all those ships out there with AIS transmitters show up right on the screen.
Irwin Citation 34