My only purchase with Douglas' was to get a powercord using Furutech bulk cable and Wattgates. Ordering and communication were good.
They run a money back guarantee, so there's no reason not to try these out.
20ft is a long run - if cost is a concern, you might also look at the Mogami and Neotech offerings from takefiveaudio, as the cable cost per foot is economical.
On the other hand, if you're not feeling the magic from the speakers, maybe the problem isn't really going to be the speaker cables...
They run a money back guarantee, so there's no reason not to try these out.
20ft is a long run - if cost is a concern, you might also look at the Mogami and Neotech offerings from takefiveaudio, as the cable cost per foot is economical.
On the other hand, if you're not feeling the magic from the speakers, maybe the problem isn't really going to be the speaker cables...