I had to grab it...for 5 bucks I couldn't resist. I never played either title, so I started with Escape from Butcher Bay...and so far, while the graphics and movement are surely dated (but I'm fine with it as a 2004 release), it's very entertaining and brutal.
I read some reviews of Dark Athena stating that Escape from Butcher Bay had revised graphics...I'm guessing that's more in the lighting and shading dept with support for SSAO 16-bit..I'm running that on max atm. Seeing as the game limits you to SSAO or AA. Still overall I'm impressed and feel I got a solid value for 5 bucks!