I just thought I'd share my experiences.
I initially looked into using Thunderbolt to run Windows off an external SSD on my retina iMac, but the prices were really expensive just for the enclosure, and sometimes it didn't come with a Thunderbolt cable making it a separate purchase.
Searching the forums brings up the DeLock enclosure. I considered it, but reviews on Amazon were mixed, and it was difficult to find (I tried MemoryDepot which was cheaper but after 10 weeks I got nothing and asked for a refund).
So I went back to considering USB3 which, with UASP provided really fast speeds. Tried out the Inateck UASP enclosure recommended here as well, and combined with the instructions at this site - http://www.michaeljjensen.com/tech/ (also somewhere from these forums) and I was able to successfully install and boot Windows on an old Samsung 830 Pro 256GB. Pretty nice, and it didn't cost me a bomb.
The only troublesome part was using Windows to run WinToUSB to "install" on my USB3 enclosure. I ended up creating a partition on my iMac just to install Windows (via a USB3 thumb drive) to run WinToUSB so that I could install Windows on the USB3 SSD enclosure
.
Here's a pic of Windows running off the Inateck on USB3. The only bad part is that TRIM is not enabled via USB3, which can be troublesome. fsutil reports otherwise, but running TRIMCHECK (I waited about 2 minutes) shows that TRIM is not enabled.
Bootcamp provides drivers in a folder in the USB3 thumb drive that you'll want to install after you follow the instructions in the site above to maximize your Windows experience.
Also recently snagged a M500 950GB for $329 on OWC (it's now $335, still a great deal with free shipping and no apparent sales tax). Grabbed a newer model Inateck FE2005 (http://www.amazon.com/Optimized-Tool-Free-Inateck-External-Enclosure/dp/B00KYF1LLI) and got some pretty good Black Magic Speed test results:
I initially looked into using Thunderbolt to run Windows off an external SSD on my retina iMac, but the prices were really expensive just for the enclosure, and sometimes it didn't come with a Thunderbolt cable making it a separate purchase.
Searching the forums brings up the DeLock enclosure. I considered it, but reviews on Amazon were mixed, and it was difficult to find (I tried MemoryDepot which was cheaper but after 10 weeks I got nothing and asked for a refund).
So I went back to considering USB3 which, with UASP provided really fast speeds. Tried out the Inateck UASP enclosure recommended here as well, and combined with the instructions at this site - http://www.michaeljjensen.com/tech/ (also somewhere from these forums) and I was able to successfully install and boot Windows on an old Samsung 830 Pro 256GB. Pretty nice, and it didn't cost me a bomb.
The only troublesome part was using Windows to run WinToUSB to "install" on my USB3 enclosure. I ended up creating a partition on my iMac just to install Windows (via a USB3 thumb drive) to run WinToUSB so that I could install Windows on the USB3 SSD enclosure
Here's a pic of Windows running off the Inateck on USB3. The only bad part is that TRIM is not enabled via USB3, which can be troublesome. fsutil reports otherwise, but running TRIMCHECK (I waited about 2 minutes) shows that TRIM is not enabled.

Bootcamp provides drivers in a folder in the USB3 thumb drive that you'll want to install after you follow the instructions in the site above to maximize your Windows experience.
Also recently snagged a M500 950GB for $329 on OWC (it's now $335, still a great deal with free shipping and no apparent sales tax). Grabbed a newer model Inateck FE2005 (http://www.amazon.com/Optimized-Tool-Free-Inateck-External-Enclosure/dp/B00KYF1LLI) and got some pretty good Black Magic Speed test results:

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