I have been using Marvella RO+ UV since july-2016. Fuly satisfied with this purchase.
Installation was swift and fast.
The 10 litre storage is sufficient.
Dispenser tap helps when there is no power and you have to get water. This scores over those purifiers where water dispensing is dependent on power, like in Pureit Ultima.
It should be noted that with RO purifiers, only 25% of input water is recovered for drinking purpose. For example, for every 10 litres of pure water, purifier will dispose 30 litres of water. Though this water is unsafe for drinking, but must be collected in buckets, etc and can be used for washing, cleaning, bathing, etc. It will still be more pure than your tap water.
I have read many reviews where people have said that such and such purifier wastes lots of water. But, this is true with all RO purifiers.