I have not played the Loudbox Artist, but if the big brother to the Mini is as good sounding as the Mini, then it's a winner. After overcoming (I hope) some ES system fuse issues that were causing the amp to hiss a lot, I am very happy with the combination of my 814ce and the Loudbox Mini. I've been through a bunch of different cables to get the best and cleanest sound and, as suggested by some in this and other forums I bought an Audix T-50K Inline Impedance Matching Transformer and a Monster Cable Studio Link 500 TRS-XLR cable. It works like a champ! In comparison to standard balanced and non-balanced cables, connecting my 814 to the Mini with this cable combination actually produces more volume.
The Mini has good EQ controls (low - mid - high) plus very effective Reverb and Chorus controls for the guitar input channel, which uses a 1/4" jack. It has a second channel on the front panel that has fewer controls and is dedicated to a mic input, using an XLR connection. Each channel has it's own, independent "gain" (volume) control, and there is a master volume control that adjusts the volume for all channels. On the back there is an 1/8" input for an iPod or other MP3 player, plus a 1/4" auxiliary input that can be used for another guitar. The master volume dial on the front panel controls the auxiliary inputs on the back panel.
The sound is very cleanly acoustic and faithfully reproduces the sound from my 814. I find that little EQ adjustment, if any, is required, but the control is there to adjust the sound according to your taste or room in which you are playing. There is also a phase switch that effectively minimizes acoustic feedback.
I use mine in my house and with 60 watts it is more than loud enough. I would venture to say that it is more than suitable for use in small venues such as coffee shops, etc., but anything larger than that might be better suited for the Loudbox Artist. I may eventually "upgrade" to the Artist for the additional features, but for now I am very happy with the Mini.
I hope this helps,
Jim