Let's Talk Pop Filters

I use a clip-on no-name pop filter. Purchased years ago for less than £10.

I have never, ever thought that the cheapness of the filter was responsible for my sub par vocals.

Until this thread I was unaware of high end pop filters.

£60 for a pop filter?

I have that exact filter and it works very well.  The biggest secret to using one of those is the placement to the proximity of the mic.  If you're going to put it right up on the mic and put the singer close to it you had better have an experienced vocalist with a good enough mic technique to know when to turn away.  Otherwise it's best to position it at least a couple inches from the mic.  Although it helps, that filter will not completely stop serious plosives from getting into the mic.  P's,  B's, F's, and V's, are the worst offenders if you have a vocalist who enunciates well.  

IMO that type of filter is as much for keeping projected spittle off the mic diaphragms of expensive large diaphragm condenser mics as it is for controlling offensive plosives.  You don't want slobber all over the diaphragms of a $3000 mic.  Build up on the diaphragms can deteriorate sound quality and also the diaphragms themselves if you're not careful.