I got one bucket from petstore.com ($55) before they corrected their price

anyway, I mixed 5 gallons last weekend, and my initial impressions are
its really concentrated. the directions say 1/2 cup per gallon, so I used 2.5 cups for 5 gallons and I ended up with 1.032 SG! my calculations show I only need 2 cups to mix 5 gallons to get 1.025. I need 3 cups of RC per 5 gallons mix to get 1.025.
no clumps at all in the salt. I have never bought a bucket or bag of salt of RC or Seachem reef that did not have clumps.
I like the bucket with a sealed lid. it is a pain to open, but I am sure the bucket has not been tampered with. unlike those screw on lid, where someone could open it and close it back. I suspect the seachem buckets my LFS is selling have been opened, but that is another story.
on the not so good part. alk is 8, ca is 380, mg is 1100. I did not roll the bucket around to mix up the contents before opening though, So I'll do that before I mix my next batch. If it comes out around 9/420/1300, then I would not mind paying the higher/corrected price next time around. Its not that much more considering you need 2/3rds that amount to mix up the same sg as RC.