An important thing to consider would be as to how they'd operate in Saawan (around August). Our tranditional Lahori coolers give up in that time and are only useful for 3 months (May-Jun-Jul)..
But given the electricity conditions, does seem like a blessing...
Price is on the higher end though. If you do end up buying, do share feedback. Are any of your relatives using it, what do they have to say ?