I've been using this Inverter for more than 2 years now and I'm very much satisfied with its performance till date.BTW it's not 900VA, it's 880 VA and yes as the description says it's very operates quietly. The longest backup I've got is approx 7 hours with two fans and a CFL 12 W bulb running continuously, I've a 150 ah tabular battery for it. It also has a quick charging feature which charges battery quickly so even if there are frequent power failures your Inverter is always ready to back you up.The highest load I've put on this at a time is 2 fans + PC + tube light and a 550 W mixer and it worked without getting tripped for overload.... Brilliant load carrying capacity.I had purchased this Inverter locally from an authorized vendor here in Goa for 5.8K, I've been using this for over two years now, though here in Goa there are many power interruptions due to heavy rain in monsoon this Inverter never gave any problem, only thing is you need to check water level of battery once in 3 months and top it up.I strongly recommend this product as this Inverter will always be ready to rescue you during power crises.