I think the Wiki is misleading.
Performance wise, if someone is going from a HDD to an SSD, there will be a huge jump. It's like going from a Ford Taurus to a Lamborghini Aventador.
The 840 Pro will be considered a McLaren F1. Does nitpicking on each spec really matter if you had the Aventador or the F1? Would you not be just happy that you have a car that does 0-60 in less than 4 seconds. If one car does it in 3.2, and the other in 2.8?
Also, it'll take a few years before the drive even caps out its lifecycles. I believe the reviews mentioned it to be around 5-7.I wouldn't worry about these reviews too much and at $140 I'd jump on it had I not bought the 840 pro at $199.
At $140 this is a heck of a lot better deal.
For the ones who have seen Top Gear &/or is familiar with this episode (S18 E1). I would say the 840 Pro is the Lamborghini Aventador, while the regular 840 is the Noble 6000. And this references performance and reliability/durability as well.