We use our Beach in seven seat mode about once or twice a year usually for airport runs when we go on holiday with our son, daughter in law and their family. So on those occasions we have four adults and three children 5, 8 and 10 years and all of our luggage which usually consists of around six cases and hand some luggage. I usually remove the multiflex on these occasions as it would just get in the way. There's always bags of leg room and everyone has a comfortable ride. Sometimes we return on night flights so we also have duvets and pillows in the van for the children so that they can sleep on the drive home. It all works out very well.
We have also used the van with seven seats in for the odd wedding and family event. The Beach is a brilliant vehicle and whilst I don't use them that often, I wouldn't want one without the extra two swivel seats. Basically you can configure it to suit your passengers and luggage.
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The above photos might not be that helpful but they do show our previous Beach in seven seat configuration. They illustrate how you can configure a Beach whilst the seven seats are in place. For these photos the multiflex was removed and the bench shoved right back as far as it will go. The pop up child seats aren't that useful IMO as they only fit a child correctly for a very small period of time as there's no adjustment. They also have little or no lateral support. You are better off getting a fully adjustable booster seat with isofix.
One final thing. The seats are very heavy so I'd recommend a small cheap trolley to move them to where you will be storing them when not in use. Don't try to carry them on your own.
We also have an Anssems GT750 trailer so if we were ever to take seven camping we could shove all of our kit in that sealed waterproof trailer and have the seats with maximum leg room. Brilliant trailer and very useful.