i bought this to supplement my DC14 animal mains vac. Both are good, but in different ways. The DC16 is not as strong and therefore better to use on loose covers and for just small amounts of fur pickup - but it only lasts for around 6 mins per charge. It is also small and light, so quick to get out and put away. Great for the car too!
It will not "do" the hall & stairs or whole lounge where there is a fair bit of hair to pick up - that is when teh DC14 animal is much better - but that tends to suck up loose covers as it is much more powerful.
So, its horses for courses - I have both and am pleased with both but they both have individual limitations. If you want just one machine, decide what you want it to do before choosing.