Well I finally did my first gig with the DL1608.
Apart from a few teething problems, such as convincing the venue that no we couldn't just use one power outlet and then getting the wireless to connect, the gig went very well. In fact I was surprised at how good it sounded and in particular how well the GEQs worked on the aux sends. I had absolutely no feedback issues (as this was my biggest concern) - I still worry about the lack of a master fader page and the how much time it would take to flip through the aux sends (especially in a panic) to adjust any offending levels but this certainly wasn't a problem last night.
Another thing that surprised me was how loud it seemed to be in comparison to the Studiolive I used the week before. Of course this is very hard to substantiate because I was in a different room with a different band, but I seemed to have more headroom. The week before I was constantly tickling the limiters on my FOH speakers (JBL PRX)- this week there was't even a flicker on the limiter lights and it really seemed louder, particularly in terms of the vocals cutting through. My guess is that the Eq works much better on the Mackie - especially the high pass filters.
I think it will take a few more gigs before I stop taking the Studiolive with me as a backup but my confidence in the DL is definitely growing