Matt,
I totally agree.
In my former life (er, job) I wrote thousands of ecomm product description for some of the world's biggest brands. It was a painful process at first, in large part because EVERY company felt that more was always better. Until I was able to show them that it wasn't.
At first, each description was bloated with text.
Then, I imposed a strict word (50) and character count (220) for descriptions, and conversions improved dramatically. Also, customer service calls and complaints diminished considerably.
Here's why: Customers visiting a specific product are more likely to know something about it, so they don't need a bunch of details. They ask friends and family members, read reviews, etc., so they're educated to a degree when they visit the page. Also, if they do have questions, it's better to have a Q&A-style setup on the page, similar to what REI does.
For folks who aren't as educated but who have landed on the page for a specific product, the diminutive descriptions means they have enough info to whet their appetites (i.e., to read reviews and conduct research) but not so much to confuse them.
RS