I've heard of people running those back when I used to do a few grow journals on another site. Looks like they are based in spain. Chances are if another seed broker is carrying them, then they are probably decent. I can't speak for delicious seeds personally however I have grown several strains from exotic seeds, which is also based in spain, and they were great.
Absolutely! I actually tried Delicious Seeds (got from Herbies) during their spring promo, and I was really impressed. The seeds were top-notch, and the variety they offer is fantastic. Plus, the prices are pretty sweet too. I had a great experience, so I'd say go for it