I can't say I've had any experience with the companies you mention, so this is just a general comment about extended warranties. Others here have suggested that they are a waste of money, and that if a piece of electronics is going to fail, it will probably do so within the 12 month warranty period.
That used to be my standard response as well, until some recent experiences that have made me re-think the issue.
I had a 46" Samsung DLP television that developed a serious problem (white dots on screen) about 4-5 months beyond the 12-month warranty period. The cost for the repairs would have been near the price I paid for the set, which is fine for something that costs $30-$50, but not so fine for something that cost over $1,000 and lasts less than 2 years. To Samsung's credit, they had received enough complaints from customers with the same problem that they realized it had to be due to a design flaw or some type of defect, and they had the repairs done by a local shop at no cost to me, even though my set was beyond the warranty period. Kudos to Samsung.
My other recent experience did not go as well. I had a Sony Blu-ray player fail less than 2 months beyond the warranty. Internet research showed this was not an isolated incident. Sony did not want to stand behind their product the way Samsung did. I finally got a reasonable resolution to the problem, but had to fight tooth and nail for weeks to get it. Suffice to say, I will not be buying any more Sony products unless I'm offered a very inexpensive extended warranty to go with it.
My new attitude about extended warranties is that for items costing more than $200-$300, I will seriously consider an extended warranty if it extends part & labor warranty for at least 2 additional years for less than 15%-20% of the replacement cost of the item in question. If the cost of the extended warranty is 10% or less of the item cost, it's a no-brainer--I'll buy it. If the product is made by Sony, I won't buy it unless the total price of the product and extended warranty is still competitive with the price of just the product from a reputable competitor.