As someone who LOVED the first series episode 'Dalek' and enjoyed the 'Daleks in Manhattan' episodes (unpopular opinion I know...) I was disappointed to find their individual volumes were bundled with episodes that I did not much care for. As such, this set was exactly what I was looking for, with the added bonus of including the Series 1 and 4 finales ('Bad Wolf'/'Parting of the Ways', 'The Stolen Earth'/'Journey's End') to boot!
Admittedly the collection is somewhat incomplete without 'Army of Ghosts'/'Doomsday', but that is probably because they were included in 'The Cybermen Collection' which acts as a companion DVD to this one.
All in all, a decent selection of episodes for someone who doesn't fancy buying the whole series, and the ones contained here are certainly very good and if bought with 'The Cybermen Collection' you can get all 4 series finales for cheaper than buying even 1 series!
However, it's not really a good DVD for anyone new to 'Doctor Who', as the jumping between series would likely confuse newer viewers.
Side note: The discs seem optimised for visually impaired buyers (a voice announces which number disc is in the machine and directs the user to audio options quickly) so worth noting if you intend to purchase for anyone with vision trouble.)