Sfz+ is simply the best soundfont player ever invented, I use soundfonts all the time so I know how hard was to find a good virtual player.
The interface is good looking and really easy to understand.
Features? well it has lots! too much to mention here, but this is what I consider important. Sfz+ has the best quality of all, is stable as a rock and the CPU usage is better compared to other "big league" samplers. Sf2, wav and giga support, DFD (direct from disk) everything works flawlessly.
Sfz+ gives you the freedom to choose a single file (sf2,wav,gig) per instance which is useful if you don't want to fiddle with multi outs, or when you load a complete bank (eg: GMs) and you can load one file per channel which is the best approach when you are loading one patch banks or separate wav files.
It's price is a steal, for the monster you get.
Customer support is awesome, you talk directly with the developer on their forums, and he does listen to his customers.
I've set the presets meter to "1" because Sfz+ doesn't need any by default.
I know Sfz and Sfz+ since early beta versions, even at that time I was completely stunned, even more with every new update. For me Sfz+ is a real winner.