i have the same one (green coloured), which i think Mr. Gulbir from primeabgb had arranged for me to get (apparently, it was in short supply at lam rd. that time/those days) 3-4 years back. have been using it since then. the air-filter bag/cloth was misplaced long back, a part near the handle suffered a crack after a drop, and i've had to stick the nozzle with a cellotape to the blower's mouth, but despite all this, the blower's been functioning well. i've marked each Friday as a 'cleaning day' when i clean my crab-cave and hoarded hazmat a bit thoroughly (though not every Friday

), and that is when i open the PC-cabinet too and give it a 'hot air bath' with the blower. this is accompanied by a vacuum cleaner that sucks up all the dust that gets spilled out from the cabinet, and to clean the keyboard as well, plus, a pair of micro-fiber cloth gloves, a compressed air can, a toothbrush, a set of broad and thin flat paint-brushes and a soft shaving brush to finish up by cleaning the remaining 'sticky' dust, the meshes, and the difficult corners.
this is the first time i came across the info that monsoons affect PCs (though am aware that high humidity conditions are bad for TVs, PCs and electronics in general). just 2 days back i had a 'bad PC/electronics day' (one of those 'e-RaahuKaalam' days that everyone like us mandatorily encounters a few times a year or a few times a few years, if extra lucky; i faced this one after a considerable time), with problems on my desktop, laptop, net-connection, etc. plaguing the whole day, but most (i believe; not solved yet) were related to software than, as news-channels would love to put it, 'monsoon ki qayaamati maar!'.