Windows 8 Store extremely unstable for anyone else?

Ever since the Consumer Preview came out I've been running it on the Samsung Build Preview tablet, and this whole time the Windows Store has been nearly unusable because it almost never finishes downloads correctly. Well over 50% of the time I try to download a new app or update an existing one it'll get stuck half way through downloading it and never finish. Restarting the computer occasionally helps but not always because sometimes it caches the download somewhere and hangs again at the same place every time. There's about a dozen apps that I'll never have now because their downloads are stuck and can't be restarted.

Has anybody else seen behavior like this or is there something seriously wrong with my install?