I wouldn't consider ever buying any ESP that's not a product of the auto manufacturer. Outside ESP companies also need to be fully backed by an insurance company or they're not worth the paper they're written on. Not every ESP company is viable financially.
I totally agree.
A couple things to remember about maintenance agreements or extended warranty plans from the manufacturer:
* You don't have to buy them from the dealer who sold you the vehicle. Generally you can buy them from any dealership that sells them unless the manufacturer limits this practice. (Toyota, for example, was not allowing dealers to sell these across state lines for a while.)
* You don't have to buy them at the time you purchase the vehicle. Generally you can buy them *any* time before the factory warranty expires.
* Authentic manufacturer warranties are typically honored by *any* dealership in the country for that make. With a third party warranty there is no assurance it will go smoothly or that the garage will take it (you may have to pay first, seek reimbursement and hope they don't jack you around).
* You need to be meticulous about regular servicing on time, and keeping all records of it. If all your servicing is done by the dealer, these days they should have record of it -- but keep the proof anyway.
What does that mean?
If you really want one, you can shop around and take your time. For my 2018 Toyota Prius Prime, I noted that some Toyota dealers were selling them for half the price of other dealers -- sometimes even less! (What they lose in margin, they hope to make up in volume and manufacturer incentives.) For example, for a 10-year, 100K mile warranty I saw quotes ranging from $1400 to almost $3000. For the same product! That tells you how much they are marked up, since I guarantee the dealer charging $1400 is not losing money on it.
Essentially these are insurance products. And like all insurance products, the company selling them profits on them, meaning that *on average* your warranty will be a money loser for you -- not to mention that both the manufacturer AND the dealership need to profit from it. But it can also, occasionally, save you from a large unbudgeted expense. Part of the reason we buy insurance, even when we can theoretically afford to self-insure, is for the peace of mind of not worrying about a massive unexpected expense. That peace of mind has some value, and if you decide the price is worth that peace of mind, even if financially suboptimal on average, then so be it. But again, shop around for the best price for an authentic manufacturer warranty -- they are the same product no matter which dealer you buy it from.