I got comments directly from Epifani today, and fwiw, they make good points...
First, they pointed out that both the Quest and the UL502 have not had limiters for quite some time, and unfortunately, the pictures are just very old. I'd assume they haven't updated the pic because it's going away anyway.
Anyway, the reason they got rid of it was because, in their older versions, the preamp design used to simply have too hot of a signal for FOH or the stage rig sometimes. They've since redesigned the preamp to have more sensible levels and also noted the adjustable level on the DI out. Basically, they said they redesigned the preamp to not need one anymore.
They also commented that limiters shouldn't be necessary if your technique is good and/or you set your levels for your heaviest playing instead of your lightest.
Whether that eliminates your personal desire for a limiter or not, is up to you, but after talking to them, I thought about it a bit, and here's what I came up with...
I must admit that I've always hated the effects of every limiter I've ever heard, so really, I've worked hard to develop a technique where I didn't really need one anyway, so in retrospect, this is really no big deal to me after all (NOTE: compressors and limiters are TOTALLY different animals when used optimally).
So I'm back on-board for the QII as long as the tone knocks me over hard. Otherwise, it's goin' back and is someone else's deal, 'cause I totally don't have money to just blow on "extra gear" right now... no matter how good the deal is... especially since I'd have to go out and spend more to really even use it (SW2.1).
I do have one pre-nit tho... I think it's really tacky that it doesn't come with rack ears... especially at its intended price point.