good service---it's what i'm using this year. automatic fair market value calculation is a life saver. and they give a 5% discount when you pay with BTC.
check your imports carefully though. they screwed up the cost basis on some positions of mine, which i had to fix manually.
it's still the best tax portfolio tracker i've found. unfortunately the free plan only covers 200 transactions. most altcoin traders will need the pro package, which costs $120 per year.