Can I ever go to the Mac counter and not buy something...

My latest purchase from Mac Cosmetics is the Pro-Longwear Concealer in ... . I had originally gone to the counter to have a look at the Pro-Longwear foundation which I believe is waterproof, as I thought that it may be a good summer foundation. I mulled it over however and I thought that I already have enough foundations to be cracking on with at the moment. I did however decide to buy the concealer after having a little chat with the girl that worked for Mac. I have never owned a liquid concealer before. I have always bought concealer in a paste-type form, my most favourite being Boi-ing by Benefit Cosmetics. A few months back I bought the Nars Creamy Radiance Concealer, a full review of which you can read here, which I was very impressed with. I love the way that it easily blends in to my foundation leaving a very flawless finish. As it has a wand applicator with a doe-foot end, it can be applied directly and precisely onto the areas that need a little extra coverage.
So a liquid concealer was naturally the next type of concealer on my list. The packaging is very similar to that of a foundation bottle with a pump that deposits enough product for one application after just one pump. I usually apply one pump to the Real Techniques Setting Brush from their Sculpting Set, a full review of which you can read here, and dab the product under the eyes, around the edges of the nose, on the chin and any other problem areas. I then go back over these areas blending the product with the same brush until it is evenly applied.
What I love about this product is the fact that it can be used either on top of my foundation, if I am having a full face of make up or going out for an evening, or just on it's own, if I am having a day at home or just nipping to the shops and don't want to be bare faced. The colour match was perfect for my skin tone and looks really natural when applied on its own or with another base product. It really lightens up my under-eye area and smooth's over any imperfections with ease. Having never tried a Mac base product before, I am very impressed and can't wait to try more of their foundation/base products.
What're your thoughts about Mac's Pro-Longwear Concealer? Would you recommend trying the Pro-Longwear Foundation?