During Beta, I ran about 150 games with my SoSebow solely because I didn't get tired of it. Half the time I got good cards, other half they were just small stuff like 1 extra damage here with a Cat, some extra quanta there that helps with the other cards in my deck. Since you get 3 cards for one, this is a real winner in my book <3
It's important to pack enough quanta though, while also not relying on the Shards. You need everything else in the bow as well, and since you do pack lots of quanta, you can bring expensive cards too, all the while keeping the ttw around 6.5