If anyone has been watching "Live From Abbey Road" on the Sundance Channel - these pop screens appear to be in constant use to this day at Abbey Road. They are on every U47/8 being used for vocals (Dave Matthews, among others). Though one can't perform any type of A-B comparison when listening to these live-in-studio recordings, they sound very good to me.
I personally find the gooseneck windscreens to often be problematic - the gooseneck construction of most models is pretty weak (and I've tried just about every pop screen on the market). They 'wander' after being placed, especially during long sessions. Some of them only will attach to certain parts of a mic stand, due to width of certain parts. I have thrown a few of them out the back door of the studio during a session, when they weren't cooperating.
I think a small pop filter without the excess contraptions would come in handy for musicians who need to read music or lyrics while playing - less clutter.
FWIW - I contacted Dan Radin at Neumann, and they are not currently offering the PS87 pop filter alone (outside of this package, that is). Apparently I'm the only one who would care