There was a very limited selection of glasses that were available for the 2-for-$60 promotion, and they really tried to upsell me to more expensive frames and lenses. Luckily I was able to resist their sales attempts and bought a nice frame and lenses from Zenni Optical. I keep one pair of the cheap glasses at my office and the other in my car.
As an aside, being able to get inexpensive glasses online has been a huge improvement on my life. I remember growing up when I only had a single pair of glasses (and a "backup" which were with my previous prescription). I had to be very protective of my glasses, and getting a scratch on the lens meant that I was stuck with it until my prescription changed. Now I can get my favorite glasses from Zenni for $25, so I have backups if the lenses get scratched or the frame get bent. I also have prescription sunglasses for the first time! No more dorky clip-on shades!