I have bought several kannada books from this website. It has always been a prompt service. They have no shipping charges(my shipping was to Bangalore), they shipped the books quickly, I got sms and email notifications at each stage. The prices are good bargains too, lots of discounts. More than all, its best place to buy Kannada Language books online.
I did see the negative review on mouthshut before I purchased, so I started with ordering a low price book. Then all subsequent experiences were great, so I think the negative review is a rare case. I would highly recommend shopping at sapnaonline.com