I just came across a new review of the Spring Design Alex. Here is an excerpt from the article:
The Spring Design Alex eReader Model DS10 provides a fresh take on the e-book reader experience. At $399 (available in either a black or a white case, price as of March 15, 2010), the Alex eReader is more expensive than competing devices, but the $120 to $150 premium is worthwhile: The dual-screen Alex offers the best combination of an electronic paper display (EPD) and a separate LCD screen I've seen yet, and the reader impresses on almost every level.I've been using a late-preproduction-run Alex eReader for the past week, and the experience has been a pleasureI in most respects. In fact, I might have finished this review faster, if not for the fact that I hadn't routinely lost track of time while devouring content on the Alex.
Engadget also posted a review (yesterday). You can find it here.