I am chasing a bluetooth receiver to plug into my audio system. Wondering if the $30 ish ones are worth it?

I want ideally corded not rechargeable, or USB charged so I can just bung an iPhone charger into it permanently(?)
Must have RCA output, to go into a 10y/o ish Yamaha amp which is a pretty sweet receiver.

Now whilst not a total audiophile I have a set of awesome irreplaceable collectable speakers so the system is capable of some verrry nice things. I lament the loss of such nowadays, as everyone plugs a phone into a poxy dock nowadays
But like I said, I am not an audiophile... just after 'nice enough' sound. CD quality

I figure if anything falls down with the bluetooth receivers, it is the DAC. Are the $30 units any good?
If the sound as good as, say, my 20y/o mid-range CD player (with integrated DAC like most, nothing special) then I'd be happy.

I'd be annoyed if it sounds a bit off, but I'd be pissed if the receiver spiked or had a funny unheard frequency output and killed my speakers..................

Comments?