I have been wearing this style of bra for almost 6 years.  I started with the 36/38 D/DD when I was nursing my baby, and then, afterwards, moved to the 36/38 B/C size. (My normal size is 36C)

I run 25 miles a week, do yoga, Zumba and weight lifting and this is the one item I cannot live without.  I have slowly collected 7 of these bras over the past 4 years, and the oldest - which has been worn and washed at least 100 times, is still completely functional.

I have tried the other bras which have come into fashion over the past few years (Moving Comfort, newer Champion styles) but this is still my favorite.  Here is why.

PROS:
1. Underwire!  I have natural 46 year old boobs, and nothing beats underwire for support!
2. Thin and Cool! - I have a couple of molded cup bras, but by about mile 8 on a South Georgia summer morning, my boobs are sweating buckets.  This (#6242) bra has cups comprised of 2 thin layers.  The first layer separates and the second layer compresses.  In my experience, I do not overheat in this bra.
3. Hooks in Back! - While aesthetically the racer back bras look better, they do a number on my neck and shoulders and are hard to get on and off.  This bra is as easy as any other every day bra.
4. Adjustable Straps!  I am tall.  Some women are short.  I am always befuddled as to why anyone would make a bra with non-adjustable straps.  These are velcro adjustable, so require less hardware, and I have never had a problem with rubbing or chafing.
5. No Uni-Boob! - While this bra does flatten my boobs (compression tends to do that) it at least keeps them separated on their own sides.  This is thanks to the before-mentioned underwire.
6. LOOKS LIKE A BRA TOP! This is the biggest plus.  I can wear this bra underneath my mesh, see-thru running tops and it looks like a sports bra top rather than a regular bra.
7. Indestructible!  I have machine washed (in a bra bag) and hung to dry my oldest #6242 bra over 100 times and it is still going strong.
8. Comfortable!  For me, there has never been any irritation or discomfort while wearing this bra.  ever.

CONS:
1. Nipples!  If you've got headlights, this bra isn't dimming them.  It does have a pocket, so I guess you could put in some sort of thin pad if you wanted.  For me, the occasional perky nipple show-through is not bothersome enough for me to put up with overheated boobs all the time.
2) Dingy!  After a while, the inner liner (which is white) will start to look dingy.  No one else can see, so I really don't mind.  Also, if you get a white bra, it will not stay that color.  I have two white bras... one is dingy and worn only under shirts with sleeves, and the other (newer) is reserved for when I am wearing my white tanks.
3) Straps Will Show!  If you wear racer back tanks (as I do 90% of the time) your bra straps will show.  There is no way to avoid this save wearing a racer back bra.  Since I cannot do this, I just play with colors and try to semi-coordinate my bra with my top.
4) Not Enough Colors!  It is hard to find this bra (#6242) in colors other than black and white.  I wish Champion would make it in a variety of colors like aqua, orange, red, etc.  If the straps must show at least they could be colorful!

So there you have it.  My complete review of my favorite sports bra!