The special effects in the BBC Narnia Chronicles serials get better with each series, and in The Silver Chair they are actually very good [for the period]. Picture quality likewise improves with subsequent serials. The naff cartoon overlays at the end that spoilt the Lion & Witch a bit are banished from this DVD (my son (9) remarked how bad they were). However in every serial the makeup for the Narnian animals is excellent and the sets are imaginative, very well made and varied - some quite fantastic in the Silver Chair. The varied cast are also totally convincing (although Aslan can get into trouble attempting lip-sync).
The story starts with Eustace and classmate Jill being chased by nasty school bullies. In desperation Eustace cries out for Aslan's help and suddenly they find themselves running in Narnia. There they discover that a distraught King Caspian has left Narnia in search of his missing son and only heir, Prince Rilian. Aslan charges Eustace and Jill with a quest to help find the missing Prince. In The Silver Chair, Tom Baker is really superb as the kind but miserable Marsh Wiggle [Puddleglum] - and the two lead child actors are very very good, with David Thwaites [as Eustace] probably giving the most memorable child performances in the entire BBC Narnia series. We were also impressed with the realistic 'nice' giants and the underworld episodes. For some reason I always find the final reunion between Eustace and Caspian at the end of The Silver Chair almost unbearably sad, something to do with lost childhood and 'age did weary them' I suppose. Try not to read too many reviews if you haven't seen the series though, as they can give away too much of the plot. Note that this Region 2 DVD set has all six episodes shown in their entirety as Aunty intended, each with the great intro, music and credits, unlike on the US region one DVD where the serials were edited and cut into a 'feature film' (badly affecting pace). Serialisation allows proper use of the scripted 'cliffhanger' and means your children can watch one a two episodes before bedtime.
The only reason not to buy this DVD is that the four DVD BBC set 'The Narnia Chronicles' is even better value as it includes the complete three seasons: The Lion & Witch, Caspian & DawnTreader, and the Silver Chair (another twelve episodes - 6 hours), plus many extras. These adaptations were screened from 1988 to 1990, and are superb value and highly recommended for anyone with preteen children over 4. These other BBC Narnia DVD's : Lion & Witch, Prince Caspian and Dawn Treader are naturally essential pre-viewing. This BBC series can't be bettered in terms of acting, content or imagination. Perhaps they compare rather unfavourably to the new Disney versions, particularly in terms of special effects, but the BBC often scores with the shear quality of it's adaptations in terms of casting, screenplay and script (Narnia fans will probably love both anyway). My only complaint really is that the BBC didn't serialise the other Narnia books: `The Magicians Nephew', `The horse and his boy' and `The Last Battle'. In many ways though the BBC's 'The box of delights' and 'The Borrowers' DVD sets compliment the Chronicles of Narnia, so try them as well.