Our 7.5 foot zodiac is a slatted floor 'rollup'
dinghy.. it works very well for us. We store the
dinghy in the forward berth most of the time, unless using it daily when we tow it. It's fairly compact but not too light so it takes some wrestling to get it below and out again. We use a 3.5 hp mercury kicker on it - a nice combination.
We prefer it to having a
dinghy on deck. The downside of doing this is, of course, if things go REALLY bad the
dinghy is not exactly ready to step into.
In actuality, since we got our two 9.5 foot plastic kayaks, we only use the
dinghy when we have company on board and need to transport more people and gear to and from the beach.