I used Astroglide Natural, no syringe. It doesn't have preservatives, unlike Preseed, and doesn't dry sticky (sorry for TMI). I got pregnant on the first month of using it (had been trying for three cycles previously). Using again for TTC #2.

I used it this month with about 1/3 of the syringe amount + a little for DH. I didn't think it was too much. It definitely made things easier, and then I worry a little less about CM so I would recommend for those reasons. It hasn't worked yet but we'll see.