TC-Helicon Perform-VG

Has some learning curve with all those features on couple of buttons, and results can be unexpectedly good or comical even. Depends what you want from it, buskers can have a blast with it because it is both vocal and guitar processor, and makes them both sound more interesting. Most important feature and main reason for buying it is anti-feedback which works but it is slow in recognizing situation. It does it's job eventually