All of those companies are known to have good customer service and warranties. A lot of people don't put much importance on warranties, and thankfully we rarely have to use them. It's kind of a gray area. Some companies are well known to take care of products even out of warranty, and really go the extra mile. Other companies are such a pain/joke to deal with that their warranty isn't worth the words it's printed with. Also realize that a lifetime no questions asked warranty = $$ liability to the company, and they probably pad their prices to cover those expected replacements.
That said, to me a warranty is a huge statement about a companies faith in their product, and it does guide (but not dictate) my purchases. Many companies defend having short warranties by claiming the consumer buys a new product before the warranty expires anyway, or they claim that true defects would be noticed long before the warranty is up. However, that's a concern for the customer, if it's an item I only use a couple times a year where a defective part might not show for years, a longer warranty is a huge plus.
On average I've found that companies that have lifetime transferable warranties, typically have outstanding customer service. The more complicated/shorter term their warranty is, the harder they are to deal with. I'm especially weary of companies that have a lot of hoops to jump though, such as demanding the original (not a scan or copy) receipt, requiring a fee to process a a warranty, pay shipping both ways etc. etc. It's also a red flag to me when they have all kinds of lawyer stipulations that void your warranty. All that says to me is that they are looking for ways to get out of covering a defect.
In my mind the warranty should reflect the marketing. If you feed me marketing hype saying the product is bombproof and the last of that product I'll ever need to buy, the warranty should reflect that marketing, if it doesn't I consider the marketing more hype than fact.
