I just got the Large Pop Pet Crate.  VERY easy to set up and take down, just unsnap the buckles and a little twist and it's all set up.  I like the hard plastic vented back panel and the door is metal with a nice knob to open and close.  My dog is about (40) lbs and medium size, he can stand, turn around and stretch to full length in the pop up crate.  I would not recommend this for a dog much bigger than that.  

Pros: very good quality for price:  very easy to set up and take down:  good support on both ends of the crate:  seems very easy to keep clean:  good air circulation:  easy for you to see in and him to see out:
Cons: does not seem big enough for a "large" up to (75)lbs dog:  would not recommend for outside - very light: