It is worth it. You can use it on anything colorfast, really. As expensive as Tide is getting these days, Persil is still about the same cost wise. I have a whole house softner, and use just over a Tablespoon in my Miele (Euro version, 6kg), but I have never had to use more than 2. So, I get almost 3 times the loads out of one box. To me, it cleans, and rinses better than Tide. I love powdered Tide products, and with coupons and sales, I can get it cheap. So, I only use Persil for fun. The scent is wonderful!! In my opinion, Persil is still better than Tide with Bleach. Have fun with it!
-Joel