I have never played a gig on an arranger. I've never set up one registration. I pick a style, pick a right hand instrument, and play. Only for fun. I thought when I bought it I might use it more than I have, but it just didn't end up fitting into what I do. It's fun to have around, and does come in handy for rehearsals when I need to go over something and can just sit down to a keyboard with built in speakers and not have to hook anything up.
Actually when I first joined SZ I mostly visited the Roland JVXP and Fantom pages, as that's what I use and needed some help with. Then, when I decided I wanted to buy an arranger I came over here and noticed that this is where all the character resides.