Any real Zeppelin fan would already have the original CDs, and know that the originals sound a little bit better than even the '94 remasters.
But see, I know why you're asking Lee.
Some reports over at SHF's that the mastering of this guy is pretty darn good. I might bite if they did all the individual CDs, but why would I bite for a greatest hits package? Do the originals, and I'd get Houses of the Holy (which IMO, the original is one of the best mastered CDs out there period), and then I'd compare.
I already have 'The Complete Recordings' Box.......and what a great set it is. I'm pretty much done with my Led Zeppelin collection....well, there is that 'The Song Remains The Same' remastered CD coming out this Tuesday - I'll be picking that up, then I'll be done.
Haven't bought it as I just bought all of the individual CDs from Yourmusic.com for $7 a piece ($14 for double CDs). That being said, if they were ever released on a high res format, I'd easily double dip.