Thoughts on the Eden Amplification WTDI Preamp?

It's a good preamp. I had one for years. Only sold it because I didn't use it much, and a friend kept asking to buy it. I liked it. It just depends on what you're looking for tonewise. It sounds clean, has a nice EQ, definitely has the Eden tone.
 
Great Eden tone in a box. Plain and simple. I used mine with a Sansamp clone and it always sounded great. Pretty touchy EQ and power supply requirements, IIRC.

I would definitely use another one if I needed that particular sound. My clean tone needs evolved past the WTDI.