I too used MB for 5-6 months with non consistent results (Thankfully I had borrowed it & not spent my own $$$ on it).
Dh even put his saliva on it & so did maddy & we all ferned all over the place??? It never resulted in a BFP for me but as soon as I started temping & OPKing I got a BFP!!
So I personally didnt like it & wouldnt recommend it.