I've been using one since 2007. What led to my decision was selling my house in WA, when I was living in AZ, and the house had been rented. I had an accountant do everything, to make sure I didn't get hosed on the house (sold when I didn't live in it, rented, and it was a personal residence, not an income property - the IRS doesn't give a poop about military moves...). The accountant I got was also in cahoots with an attorney, and guaranteed the work, with free attorney's fees, if necessary (talk about using your buddy... <laughs>). The IRS DID get into my poop over that, and the accountant/attorney tag team handled that poop wonderfully. <thumbsup>