I haven’t read what anyone else has said, so forgive me if I’m repeating anything…
Honestly, if you don’t travel or gig with your gear, just throw a tea-towel over it on the desk, and save yourself the money.
But if you do travel with your gear, Decksavers are a no-brainer. And not just because they protect the gear in various ways, but also because they allow you to use a wider variety of travel cases. That is to say, without the Decksaver, if you really want to keep your gear safe, you’d have to find a hardshell case of specific dimensions. Whereas with the Decksaver, you could use any number of semi-rigid softshell cases, of which there are simply more styles to choose from. Hell, you could even put several pieces of gear in the same bag, with accessories, etc.
As for those worrying about the paint on the corners of their gear where the Decksaver makes contact, well… I’m sorry, but no self-respecting working musician would be caught dead complaining about that. Seriously, if you’ve ever seen real touring instruments and their peripherals, then you understand what kind of abuse they are subjected to and otherwise built to withstand.
To that end, you might consider such wear-and-tear to be a right of passage, if not a point of pride. Hence why the posers of the world are out there paying extra for brand-new “road-worn” guitars.
Cheers!
P.S. Of course, it also depends on what kind of touring you do. I mean, if you’re flying a lot, forced to check your gear as luggage, well… At that point, proper ATA flight cases become necessary, regardless of whether or not you’ve invested in a Decksaver.