When Acer introduced the Aspire S5 ultrabook at CES in January, it did so to considerable fanfare. The company said it was the thinnest ultrabook yet, and that it didn't cut corners to get there: the S5 has a Thunderbolt port (good luck finding one on another ultrabook), a huge 256GB SSD, and a bizarre ports panel called MagicFlip. Thin, light, fast, and Thunderbolt sounded like a gang not to be trifled with.

More details rolled out over the last few months, leading up to the S5’s release. The final model ships with a Core i7 Ivy Bridge processor, a look that’s much refined and improved over last year’s S3, and a price to match it all: at $1,399 it’s one of the most expensive ultrabooks on the market. Competing with devices like the $799 Lenovo IdeaPad U310, Acer has some work to do to prove that the S5 is worth the extra outlay. How does it fare? Let’s find out.