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You need to ensure your mains flow rate is adequate enough that the accumulator is used only to supplement it. A 500 litre accumulator only gives approx half of that in usable volume, which won't go very far with more than two high flow outlets in use.

The OSO system is no doubt very slick - their marketing certainly is. However, I've looked at their prices in the past, and for what they're offering, it seems to me to be quite expensive. A 500 litre Reliance accumulator with replaceable membrane can be bought for under £600, for example. As long as you have somebody who knows what they are doing installing it, I doubt it'd come anywhere close to the price OSO are asking for.
 

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