We bought one for my son b/c it converted to a toddler bed and we needed his old crib (which didn't convert) for his infant sister.
If I recall correctly, my husband grumbled a little when putting it together (their instructions are pictures only, no words) but it wasn't terrible to put together.
Pros: It is sturdy (my son puts it to the test! plus, all 4 of us sit on it every night for story time and it shows no signs that we're stressing it out)and space saving. Of course the fact that it converts to a toddler bed (smaller than a twin bed) was a big plus for us. finally, it was a great price; I think we payed about $100 for the crib and $20-30 for the mattress.
Cons: The mattress is not like a regular crib mattress, at least the one that came with the crib we bought isn't. It's not waterproof so I would definitely buy a cover to go over it. Also, the one we bought does not have the option to raise/lower the mattress like most other cribs. It is very low to the ground which would have made it a real pain in my back to use with an infant that could not stand up to be picked up.
I hope that helps! If you buy one, when you convert it to a toddler bed and then buy a pillow, quilt, and a set that has the duvet cover, sheet, & pillow cover in it, buy two of the sets so when one pillow case is in the wash you still have one to put on it! I regret not doing that and since the nearest IKEA is an hour away, it's been over a year and a half and I haven't gotten back out there to buy another one!