I recently received the I Just Wanna Run Tech SL from Lululemon in Wish Blue. I gave this top a shot after trying the Run: Energy SL (with pleating in the back) and not loving the fit. I wasn't sure how I'd feel about the pleats along the front, but I really like them! I think they do a good job of disguising your mid section when you are in an unflattering position (i.e. bent over while riding your bike or in spin class).
The crops I'm wearing are the Empower Crop, if I remember correctly (not the version currently available on the website; the pair I have is older). They're made of luxtreme which is a great lightweight, smooth, moisture-wicking fabric. I'm able to pedal quickly with no chafing and no riding up. There's mesh behind the knees to keep you cool. Also a small zip-pocket at the center back for a card or key. I don't know that these are the most flattering from the back-view, but I find that these crops don't reveal sweat in the bum-region which is a big plus.
This top is supposed to have a loose fit, but even so, I found I had to size down two sizes. My normal size was way too big. One size down sort of fit, but was kind of long in overall length and a little droopy in the arm hole openings in the back. There's a cinchable drawcord at the bottom and a hidden pocket at the bottom of the center back for a card or your house key.
This top is lightweight and breathable and has anti-stink and anti-static properties. In my limited use of the tank so far (an 8 mile run in 80 degree weather, and an hour long spin class) I have found that it doesn't cling, and it didn't smell bad after either.
People sometimes question how much different colors or fabrics will show sweat. I'll show you what I looked like after I drove home from my hour-long spin class (ew, gross, sweat).
Uh, so, yes. You can see sweat on this top. But, this tank is made for sweating in. I really like the fit and the fabric of this, and I would consider picking up a second one in another color if I came across my size.