I had a good look at them a couple of weeks ago in the showroom. The only one suitable for a family of 4 is the Quattro - the others only have a couch that can be converted to a bed about 1700 x 1600 (from memory, don't quote me). Suitable for two small kids, but won't work as they get bigger. The quattro looks pretty nice, thought I personally think the kitchen should swing around 270 degrees (like the solution hard floor and soft floor models), that way it isn't in the way of the steps. I think that Modcon have well thought out trailers and tents and the build quality looked good.
We have ordered a Solution softfloor (now the wait) - couldn't swing the extra for the Quattro, but really keen on it. The other thing that swung us to the softfloor is the good tent design, and the better load carrying - you lose some with the hard floors.
Haven't got it yet, but the experience so far has been positive - found Kerry at Modcon really good to deal with - happy to talk, listen and show and follow up.
cheers,
Richard