Might be worth avoiding for US productions. But as far as I know, there is no speed-up/speed-down for UK productions PAL DVD. I've certainly never noticed anything ... and you do get higher resolution from UK PAL DVD compared to NTSC DVD (576i compared to 480i) ... though I have a DVD player that upscales to HD. Sherlock looks great on DVD ... with Series 1 available from amazon.co.uk for only £4.99 (Series 2 comes out next week at £12.99); of course you need a region-free DVD player. (though if you've got Blu-ray, you might as well get those, £6.99 for Series 1, £17.49 for Series 2.As for the UK DVD/Blu-ray releases, I would recommend the Blu-ray versions (Region-Free, or even Region B if you can handle them) because they don't suffer from the ANNOYING 4% speedup that the PAL (UK) DVDs suffer from (that's why the running times are different). I never really gave it much thought until I compared the PAL and NTSC versions of the Star Trek: Enterprise TV series. Needless to say, I won't be buying any more PAL DVDs unless I suspect that there won't be an NTSC version released in the near future. You get what you pay for when it comes to PAL DVDs -- an inferior product.