Stealthplug with Amplitube 2 Live and a plug-in for Garageband works really well. No latency ever on my MacBook. The software is easy to use and the amp models and effects are not only really accurate, they have taught me a lot about Marshall and Fender amp settings as well as a half dozen historic stomp pedals. I bought one for my son to use and he loves it to. With a guitar (I have a Strat), gig bag and a small computer bag, you are ready to plug into a house system or external speakers and play. An advantage to physical amps and pedals is that you can store the settings you like or use the many presets that come with the product. Also, it has a great tuner and the ability to play along with MP3s that you drag into the software and allow you to change the tempo without changing the tone. The Garageband plug-in also works very well. This is a tremendous bargain for the price, especially for traveling musicians, parents who don't want big amp sounds in their house etc.