The effects and amp models are realistic. The sound is great. It stacks super well, I use an overdrive in front of it, makes the amp models come to life. Sound good either way! You can get cab sims on most amp models on the stereo unit by using the right (bottom) in.output jacks. I need more, because the sounds are awesome. Responsive. Hotone's modelling system is the best I've ever heard. The price, service, and speedy delivery were also great! Sam Ash is a great store, always high quality instruments, effects, and amplifiers!