Calma Medela nipples

Michelle
Anyone use these? Peanut is ravenous after his night time sleep and won't be paced normally on a bottle (my husband does this feeding as I have to get up for work) 
Please share your experience! It'd be super convenient if they're ok since all of our other bottles are medela to fit my pump. 
 (At $17 a nipple, I don't really want to get them if they're universally terrible)