I use a rec wing for cold water singles but largely because it is my retired doubles wing (replaced in that role with a 55 lb Halycon wing). I got it originally for $90.00, it is still in great shape, and I don't dive single tanks enough to justify buying a dedicated singles wing.
The Scuabpro Rec Wing tends to taco excessively when used with a single tank and using the bungees is a must to keep that to a minimum. On the plus side, air trapping is not generally a problem with the bungees in use and the bungee system is much more snag free than most other wings. The SP Rec Wing is well made and is essentially a Dive-Rite Rec Wing with only a few minor differences
For doubles, the Rec wing is a bit narrow and tends to get compressed between the backplate and tanks if the tanks are larger in diameter than 6.75" diameter steels or 7" Al 80's.
But despite the draw backs, if you only want one wing and want one that will work for both dive single tanks and smaller doubles, it does that more or less impossble job far better than most wings.