AIP sounds amazing! The compression and EQ sound incredibly warm and the proprietary processing button really helped me get another notch up in size on my guitars. I've actually found it really useful on acoustic guitars and synths as well. The insufferable midrange filter is dialed-in perfectly for reducing harshness and then introducing some smooth high end back in. Of all the plugins I have that serve basically as channel strips on a console, this one is BY FAR the best sounding.