Relatively new Discovery-owner, here. I might be a bit late to the game, but here are my thoughts. In my opinion, you would be hard pushed to find riser with a better value for money than the Discovery. It's solid, no fuss, does what it is supposed to to. That being said, I wouldn't buy it again, but go after the DAS Dalaa. I'm just not too happy with a few details. First of all, the shelf is not properly arced, so you need to modify the shelf or use an elevated rest. Not a big deal, but you should be aware of that. The riser is cut past center, of course, but not terribly much, I find. With a springy rest or basically any other screw in - even a thicker stick-on - it could get difficult to get true center shot. Maybe it's just me - I'm a beginner - but that's the trouble I'm having with it. Since the plunger holes are not pre counter-sunk, either, I even had to drill one of them 1/8 in deep in order to get my Accutune flush. Additionally, above the shelf the riser isn't very thick, so you might have difficulty to tighten screw-on rests that are built with a more beefy riser in mind. Push Archerys Accutune, for instance, can only be tightened to the riser using a pretty substantial extra washer - at least 3/16 in. And that is definitely not to be blamed on the Accutune (shout-out to The Push - great rest!). Another thing to consider is that the riser comes with aluminium limb bolts. This might be standard, I don't know how it is with the DAS riser. I would expect the DAS risers limb bolts are made of stainless steel, though. Samick sells ss limb bolts as an extra for a really whopping premium, but as of now isn't even able to deliver. I asked my retailer about it and they told me, that they asked Samick four times when the steel limb bolts become available again and didn't even get an answer. I guess that tells you sth about the manufacturer....
As said before, I'm a bit torn. For the price - I only paid 200 USD - it is a fine riser. But although the DAS is way more expensive, I would go after the DAS, even if I was offered the Discovery at the price I got it for.
Just my 2 cents...