I like that they are very easy to use, quick install plus you don't need expensive software (as per comparison with other companies).
The customer service is good too - their support team always answers fast! It's not perfect yet but it can get better when we have some more updates from them in future releases of qnopy agent/frontend as well so please continue working hard for our benefit only ;) We tryed several different options before deciding upon using this product instead because all others were either way complicated or cost us much money which was unacceptable at low price levels :).