Positive experience of (almost) exclusive pumping here. I had intended to BF from the start but my DS had a significant tongue tie and couldn’t latch unless I used nipple shields (he had a frenulotomy when 5 weeks old but it didn’t improve his feeding). So initially I used a combination of BF with nipple shields and pumping, but that was really hard work. Because it was difficult for him to latch with the nipple shields (they would get slippery with milk and slide, or he would flail and knock them off) and he wasn’t getting vast quantities of milk that way as the nipple shields reduce flow. So he would be on the boob for hours and then I would pump after that to keep supply up- it was exhausting!
I stopped BF with the shields and switched to pumping with very occasional formula top ups and that worked fairly well for us. I had a (fairly cheap) double electric breast pump and could produce 150+ml in about 10 minutes, which I initially did about 6 times in the space of 24 hours including once in the middle of the night. So a max of 1 hour in 24 pumping. We had a Tommee Tippee steriliser for the breast pump which was quick and easy to use- after a few weeks I could and did strip down the breast pump in about 2 mins when half asleep! Also used Mam feeding bottles which are easy to sterilise with water in the microwave if you don’t have a steriliser. In one sense, it was a much more efficient way of feeding DS, because it took me 10 mins to produce and him about 20 mins to drink a bottle (when he was very little, less later) rather than him being on the boob for hours each time.
I won’t lie- it was a bit of a faff with the frequent pumping and sterilising. I used to envy friends who could just get their boob out and put the baby on it. But, the great advantage was that my DH could and did share in the actual feeding (so during the night-time wake up, he would usually give DS a bottle while I pumped for the next feed, and he did a couple of bottle feeds during the day as well). My DS was used to bottles from the start so we never had the problems of bottle refusal that some of my EBF friends faced when they went back to work. And if I wanted a night out, I would just pump and leave a bottle of expressed milk before I went whereas some of the EBF ladies didn’t feel able to leave their child for more than about 2 hours in the evening, ever!
So I would say it can work well- so long as you have a good milk supply. I don’t think it would be doable if you were spending hours and hours pumping to produce a bottle.