FX Impact would be nice. If you're into that. They seem crazy accurate and have to be a lot cheaper to shoot than centerfire. Rifle itself pricey.

Huh?
I was wondering how we got on the subject of firearms, was wondering if you accidentally posted here until I remembered I mentioned making a lockbox for long gun in the back of the cab. Once I figured that out I had to go look up to see what you were talking about.
No thanks! To each his/her/its own, but I like for my bang sticks to go bang. Price isn't my only dislike with them, but you mentioned being cheaper to shoot and it is an easy metric to look at. The air rifle you mentioned carries a $2K price tag, plus you've got to get the equipmewnt for filling the tank as a standard air compressor won't work. For the price of all thing I could build a nice AR (or two) and quiten it down. Not that I need to build another AR. I've already got something to quiten it down, though having a Form 4 would probably be nicer than the Form 1 I have now. I have no shortage of boom stuff, just a shortage of time to use them.
That unit you name is essentially an air rifle version of a 22lr, as such I can't compare it to a centerfire rifle. Rimfore sure, but not centerfire. Obviously there are different grades of pellet that are going to cost differnt, but I can't expect it to work well with what you'd find on the shelf at WalMart. Going on the ammo mentioned by the article where I read about the impact you're looking at around 10 cent round for the air rifle pellets. Well 22lr is also around 10 cent a round. As such I'd say its about the same price to shoot. I can pick up a Ruger 10/22 for less than $300. Hell since the air rifle is practically silent, lets throw in a silencer for the 10/22. That adds another 500-600 after the tax stamp. I can get a silenced 10/22 with $1000 worth of ammo to match the price of the air rifle, and after that they cost essentially the same to run. At this point I'd say that the traditional bangstick wins out in affordability.
The add the fact that the air rifle is going to run out of propellent, the traditional cartridge has propellant built in. Once the air tank goes enpty you're done playing with your air rifle, while you can keep going with your rimfire as long as you have bullets. You can get a portable manual air pump to carry around with the rifle, but I can't imagine getting the tank up to 3000 psi is going to be quick or easy.
Also FWIW I've been through this with a co-worker before in the past and looked into them a fair bit back then. He swore by air rifles, and he spent tons of money on higher caliber units. His main reasoning was that he thought he was getting one over on the government since their sales weren't traced/traced and didn't require background checks. The irony being that he works for the federal government, holds a security clearance, and is required to go through periodic background checks. While I can't say I didn't have as much money tied up in firearms, mine were more practical, more useful, and more plentiful.
Not saying they don't have their place, exterminators used to use them for clearing pidgeons out of hangars at the base and they worked great for that. I think that down in FL they are used a lot for iguana extermination in urban areas. It isn't necessarily cheaper and it isn't for me.