I love the AC-33 and have played some medium large 60+ people venues with it. The built in kickstand elevates the sound upwards for more coverage. With separate channels for the microphone and instrument, it's easy to get a balanced sound. The anti feed back switch turns on an automatic circuit so you do not have to fool around to stop feedback. There are also separate effects controls for the microphone and instruments channel, so you don't have to share effects for both. Additionally, the AC-33 has separate auxiliary inputs with their own volume control. This allows you to play a CD player or MP3 player for backing tracks or just to play recorded music if you like. There is also a built in 40 second looper, that allows you to build endless tracks of instruments, vocals and sounds. The AC-33 is also engineered to work at full power on rechargeable NiMH batteries, saving both money and the environment. It does all this with only 8 AA NiMH or alkaline batteries. The AC-33 is very powerful at a total of 30 watts (15 watts X 2) and has a stereo or mono output to run a line to a larger P.A. system. This is another great benefit of the AC-33, as you're always in control of your own sound. The sound engineer of the large P.A. system can adjust volume and overall tone, but everything else is controlled by you through your AC-33. I also have two BA-330 systems that I connect together using the Stereo Link feature, that gives me 4 microphone and 4 instrument channels, along with an auxiliary input. I tried the Fender Passport Mini at the Winter NAMM show and was impressed with it's performance, which is similar to my Roland Cube Street's (The Fender is half the cost of the Cube Streets and lighter). I just do not like that it uses C size batteries. There are adapters that will allow you to use AA batteries in it. I may still get a Fender Passport Mini, for traveling. I own a lot of battery powered equipment, as you can read about in this thread:
http://www.ukuleleunderground.com/forum/showthread.php?5333-Battery-powered-ukulele-amplification