Good price for this series. The UK release is authored using the same video and audio as the Madman Entertainment release which goes for ~$40 individually at JB for 2 discs (or $160 for 8 discs in total).
As for the release itself (and same goes for the Madman releases) it suffers from field blending and hasn't transitioned to the film->pal conversion like newer releases. To the non trained eye, it's not noticeable but worth mentioning regardless. I believe this was done to keep consistency throughout the series.
Edit: I forgot to mention that these are region 2 discs and hence will not work on Australian consoles (PS2/PS3/PS4/Xbox360/XboxOne). However it should have no issues on computers or the majority of standalone players (unless it's > 12 years old).
Series 2 $42.99:
http://www.ebay.com.au/itm/Naruto-Shippuden-Complete-Season-…
Series 3 $38.57:
http://www.thenile.com.au/movies/Naruto-Shippuden-Complete-S…
Series 4 $29.51:
http://www.ebay.com.au/itm/Naruto-Shippuden-Complete-Series-…
I can't remember what Series 1 was about?
I recalled that Naruto was a bit better than Shippuden.