First off, you need to beware if you are a fan of the US version of Whose Line, for this will be your downfall!
Unless you are very okay with UK humor, you will probably find the shows long and slow. We're used to shows now that last 22 minutes, but back in the 88-90's UK, shows were 28 minutes long. 28 minutes may seem kinda long when instead of being timed to the second, playing with props and singing Tina Turner-style... you have 4 straight faced comedians that improvise stories for 10 minutes in the style of Stephen King, Proust and Jane Austen, taking themselves a little more seriously than Colin and Ryan playing "Greatest Hits" with Wayne.
In that sense, you can say the UK's Whose Line, the original, is more intellectual than the US counterpart, perhaps because it came in before and wasn't yet paced to the level of excellence reached by Drew Carey's version... and because it comes from England... somehow it fits exactly what you'd expect older and smarter England to sound like... sorry...
So buy only if your thirst for Whose Line is unquenchable and that you bought all the Warner DVDs, praiying for and mega 20 discs box-set every night and wonder what possible product could fill that indispensable need you have for improv... well until more Drew Carey and company appears on the shelves, try this one. It gets funnier near the end of season 1, on towards season 2.