it's not well priced if it fails to work after a short time. Have you read any of the reviews?
I agree.. but people also need to work on how other products work.. and if they are less reliable.. particularly with Time Machine.
Personally I now use Synology NAS.. but I also have a TC.. it has been quite reliable.. after the 3rd replacement..
For reliable backups, I also use Carbon Copy Cloner to local USB. But TM still does incrementals the best.
I also believe in having applecare.. so simply go to the effort to make sure the TC is covered for 3years.. if it fails return it immediately for replacement.
Much of the problem is not the TC alone but Apple later OS networking is suffering from radical changes Apple is trying to make.
eg. http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/
Backup over network has gone downhill since Snow Leopard.. and if you read around it also has to do with apple sticking to HFS+ as an outdated and outworn file format.
http://michalmoroz.com/writing/exploring-time-machine-hfs-plus/
In terms of a wireless backup target for TM.. you can buy a Synology NAS plus a wireless router.. plus the required hard disk/s and you will end up with a better faster system.. reliable.. no so sure.. but it sure is a lot more expensive.
In the end network backups over wireless are perhaps a bridge to far as long as wireless is still in a state of shock from all the changes .. upgrade to laptops leaving the wireless non-functional or unreliable.