I have one and like it. It has a built in sound card so connecting to a PC via USB for the digital modes is fairly straightgforward. Most of my operating time has been PSK, WSPR, JT65. I've never used it for D-Star.
The just-discontinued Icom IC-7200 also has this feature. If you're in the market for an HF rig take a look at the just-released Icom IC-7300. It looks like a sweet rig.
If you have any questions re: the 7100 let me know.