Sadly I just can't get on with invisible zips. I can put them in okay, but the teeth always seems to break after a couple of wears so that you can still pull the zip up and down but it doesn't either open or close. I've been known to make an emergency night time trip to the neighbours to get assistance as I couldn't get my dress off. I was also on a date once and literally wet myself because I couldn't get my trousers undone. What was even worse about that was we were on the moors in a pub and he was driving, and I had to sit on his dog's towel on the way home so that his seat didn't get wet. So no, invisible zips are not the way to go for me! I find them particularly bad crossing seams, particularly on dresses where the bodice meets the skirt, they'll go in fine into the waist but then get stuck going out of the curve (and it's not because the dresses are too tight honest!). It's so frustrating, someone 'in the know' suggested using a small hammer and flattening that bit of seam but I've lost so much confidence in them now (I have a pile of dresses in the alteration basket waiting for me to replace the broken invisible zips of dresses I have bought) that I am happy to do lapped or normal zips. If I say so myself, which I do, I put in a mean zip, mostly because a badly inserted zip to 'her in charge of quality control aka muv' seems to have a Belisha beacon next to it which only she can see. I joke you not, she is like a fox who has just caught sight of a rabbit if she sees a wonky zip, the back goes ramrod straight, the head swivels and the eyes focus and from that point onwards she cannot be distracted .......