I do... i use a behringer mixer that has 4 xlr's in. I split my axe at the panel, go stereo to 2 channels on the mixer, split my vocal mic, one to FOH, one to my mixer, then i get a band mix back from the FOH, if he is unwilling to supply I use my whirlwind director directbox and get a feed off of one of the wedges. Then out to my carvin em900.
I have custom triple driver buds... probably the most important part, nay... the most important part.
I made the xlr splitters, you can buy them though, also helpful to have a bag of adapters, gender changers so you are ready for anything.
I have picked up a K12 recently and will add that so there is no void in the stage volume for people up close or on the side of the mains... last time I was told i was not loud enough.