Maybe things have changed, but here's a picture of their warranty from only a few years ago.

It specifically excludes warping, which is what was referenced in the yelp review above. I've personally seen numerous warped covers and personally seen Eco refuse to replace them.
And if their arms are covered under the lifetime warranty, why do they sell them through a link on their website? If you click parts in the first link, it takes you to the 2nd link.
http://www.ecospas.com/https://www.fusionspaparts.com/Spa-Arms.htmlIn creating this post, I noticed that they now put their warranty on their website. They did not use to do this and it looks like it started in 2017. They also changed the warranty to state that the plastic arms are now covered. This also appears to be as of 2017. I'm assuming anyone who purchased prior to 2017 is not included in this, which is why they sell the arms for $40 a piece on their website.
I don't have a vendetta or anything. I'm just simply stating facts and things that I have experienced firsthand.
I'll be the first to admit when a competitor of mine is a good company with a good product. I've clearly demonstrated that for years on this forum. I try to remain objective and honest. It disgusts me when companies engage shady business tactics. It's not hard to be an honest business person and make money.