I've been using them for years as "Wix" branded test kits. I get them through Amazon or Rock. Price at Amazon ranges from $13 to $21.
Over the years, they've helped me to figure out that two Jasper rebuilds were the total crap that they were... and that Formula Shell is a weak product, and definitely not the PCMO version of Rotella that many would like to believe it is.
When I mail them off, I use the same white and blue Amazon padded bag that I get them in. Costs $2.84. Sails right through the USPS in that Amazon bag. Results arrive within a week. ALS has a website that keeps all of your test results in one place, they can be put side by side for analysis.
Includes TBN, but not fuel. I like them, especially if you can get them for a good price. They have a couple labs across the country. The one in Portland processes very quickly. I've had them turn around results in 48 hours. Plus the shipping is pretty reasonable with USPS. The total cost last time was under $20. I bought a couple kits from RA when I was purchasing other items.