It all depends. If you have a leak free set up and look after your stuff then it's overkill imo. A heavy duty rubber matt cut to the footprint of your van floor is sufficient to protect against scrapes if it's already in good nick. If ptotecting the investment of your van and its re sale value is of high importance then a professional speedliner is going to be more worthwhile if you are likely to get the floor regularly wet or carry a lot of equipment and take less care. Avoid protectakote, whilst it looks good to begin with, it's a messy smelly job even for those with a DIY inclination and will eventually lift and chip and de value re sale of your van - good in an old beat up van, less good in something half decent.
Personally I'd not bother for now, I'd just remove any ply from floor and lay down heavy duty rubber matting. A PF system or any equivalent should have quality leak free connections. With care for your equipment it should be sufficient.
But, if you have the budget for £600 + your new set up and want to do nothing yourself or at a later date then its probably worth it. Your choice.