I haven't had any experience with old Radway magazines, but I do have some with a new one. That is, if you mean the phosphate gray (grey, if you like, in deference to the Limeys like me Mum) steel 30-rd ones.
When I first picked up one of these mags, I was impressed with the workmanship. Of all the AR-15/M-16 type mags I've had, including many USGI, Colt -- and the nastiest of all, USA -- this magazine has the most precise lines and appearance. The quality control must have been pretty darn good.
Oh, I almost forgot why I bothered to comment: There isn't a "button," which I assume might have been on the floorplate to facilitate removal. There's a 3/16" hole in the floorplate about ½" from the rear of the mag, but no button.
And this mag is, as I noted initially in my post, steel. If you ever had any worry about "drop-free," the sheer weight (empty) of this mag will overcome any concern. Not that I've ever had any concern in my AR's, but you know the feeling.
So far, they've functioned flawlessly, albeit with a variety of 62gr FMJ fired semi-quickly down by the river. HP and SP have yet to be tested.
One regret: I should have bought all 10 of them that were on the shelf.
Lastly, I'd like to have 20-rd versions if they existed, but I'm not complaining. I still have my Universal/Simmonds 20-rd Air Force mags I bought a couple decades ago.