I personally don't think the quad is worth it... and I love quads LOL!
It's allright... I used mine once or maybe twice and the pink (et tu Bouquet) doesn't show up well, even with a base like Fresco Rose pp. Sweet Lust is a much better alternative IMO. It gives a little pink sparkle when I put it overtop other pinks. caviar dreams is nice but nothing I have to have. And I already had Brule and Retrospeck which aren't must-haves either. For the money, you are getting 4 shadows which is a pretty good deal, but personally I wish I would have saved the money for a unique quad. The Chanel Perlees quint is AMAZING and it's only $65 for 5 colors and they are all great texture, good quality, very unique shades.
I am getting tired of MAC's collections lately- they are all the same colors over and over again, or similar enough to wear you don't need them, and the quality of the shadows has been BLAH! There are many other brands that offer better quality and nicer shades that I have been leaning towards. I've also been buying perm shadows because I feel you can get better quality and most of the LE colors have something similar in the perm line (not to mention the pro pans are a great value for $11 or whatever it is). I use to be a TOTAL MAC junkie but these collections have disapointed me lately.