I use a pair of 1964 quads. When playing with a band I use them with a personal monitoring setup called the POSSE. To be honest for me it is pretty much the ideal solution - but you are going to spend an extra 5-7 mins in setup and tear down.
The biggest plus in my book is being able to manage the stage volume - with traditional in ear setups you get a disconnected feeling from the rest of the band. Some bands will go as far as setting up stage mics to feed in to their in-ear mixes. This POSSE thing has ambiant mics built in to it so I can plug in and control my guitar, vocal, stage and monitor mix all right there in front of me without impacting anyone else.
To be fully transparent - I have stopped using it for accoustic gigs cause that 5-7 mins is a pain in the ass when doing a 45 min opener (which is my main thing right now). But in a band situation it is a dream for me. YMMV
POSSE - posseaudio.com
1964 dual drivers - http://www.1964ears.com/product/1964-V2 ... ar-Monitor
note: they don't do the old quads anymore - they upped to v6-stage