Anyone else breastfeeding with nipple shield?

I have very large, flat nipples. When baby tries to latch the nipple gets inverted and she gets frustrated. I've been breastfeeding using the nipple shield for 5 weeks now. Any advice on weaning? How long did you use yours? She is properly latched on the shield, gaining weight healthy, and getting enough milk but I'd like to wean to make it easier to feed. 
I'm also curious to hear from anyone who had to use the nipple shield for longer period of time and what your experience was. Thanks!