Meg, check out this link to trailspace.com. It has ten more reviews on this tent that will help you get a better opinion on the tent and condensation.
http://www.trailspace.com/gear/black-diamond/skylight/

As with all single wall tents, you will experience condensation. Whether it's a big problem or not will vary with each person. I own a 2 person single wall and whenever it rains or is cold and humid, I will have some condensation on the inside. When this happens, I use the MSR Packtowel to wipe down the condensation, or I just wait until it evaporates. If I'm expecting to spend several nights in the backcountry and expect more than 1-2 night of rain, I pack my double-wall tent.

If you are expecting to use your tent where it will be raining frequently and/or humid, you will be a lot more comfortable getting a double-wall tent.

Agreed with Eli - this tent will condense much worse than the copper spur. Go for the Copper spur 3 (barely any weight penalty over the 2) before the Hubba Hubba with Gear shed (read: pain to pitch) though.

Also, None of the above mentioned tents are exceptionally durable - the Skylight features THIN nanoshield that isn't waterproof. The Hubba Hubba and Copper Spur both feature the same pole system that doesn't do too well in wind, and ultralight fabric for the rainflies.

And now for my suggestion - I noticed you didn't mention "price", "availability on backcountry.com" or "freestanding" in your criteria. Have you considered a Hilleberg Nallo 3?

Likeability - These remain totally dry while being pitched in the rain, Pitch super fast, come in 2 colors, have multiple pockets plus attachment points for a clothesline or gear loft, and will garner you total respect from all who frequent the mountains. What's not to like?
No Condensation - Double walls and tunnel venting prevent condensation.
Durability - Proprietary fabric and tunnel design yield a tent that can withstand legitimate 4 season storms. Gusts to 60mph+, no kidding.
Space - 64"x88" + Vestibule
Weight - 4lb 10oz min/5lb 5oz trail. Compare to 4lb 2oz min 5lb trail for this tent.

The downsides? It isn't free standing (but pitches quickly), and its $625.

Hi Megan,, For your priorities of avoiding condensation and durability, I would lean towards the Copper Spur UL2. Any single wall tent will have condensation after a downpour or in high humidity & cooler temps.

As far as another recommendation, I think the perfect tent for you would be the MSR Hubba Hubba 2 person tent, combined with the Gear Shed vestibule. The gear shed provides tons of extra room for outings when your bring the dog Especially when it's raining and you don't want a wet dog crawling around your sleeping bags and gear. It's going to be a little pricier, but I'm sure you can find a great deal online.

The tent itself is freestanding, but the convertible portion needs to be staked out with at least two stakes for the vestibule.

You can't quite seal it all the way off. The vent at the back has no zipper but is pretty well protected. As for the vestibule...the front part comes down and buckles into place on either side and then has a hook on either side at the front pole as well. Staking it out brings everything very close to the ground, essentially sealing it off. You could pile just a bit of snow along the two edges to make it seal if you really needed to. This tent actually won Backpacker Magazine's lightest mountaineering tent award too so you should be set!
http://www.backpacker.com/gear-guide-april-2010-gear-review-black-diamond-skylight-mountaineering-tent/gear/13904

John, I have a Nanoshield Highlight and have yet to camp in it. I did however set it up in my driveway during a huge rain storm (un-seam sealed) and sprayed water from a hose on it at the same time. I too was curious about Nanoshield. After an hour or hard rain and 30 mins. of me squirting it, I found about three drops behind an interior pole. It was virtually floating in water. I was shocked! I will seal it and will have no problems taking it out on the trail.

I am going to ask the same question. I liked this cool tent, but comparing materials I think a MSR hubba is better choice. Nanoshield only supports 900 mm column of water, hubba 1500 and the floor 2000 whereas the hubba 5000. Could anyone give his oppinion?