I have that pump and a 9mo BF DD so hopefully I can help. It's a good pump, I also have a Medela manual pump (for popping in my handbag when out and about and away from DD) and the electric one is better. When the milk has been in the fridge or freezer it does develop a bit of a soapy aftertaste, which didn't bother my DD, but she would only have the milk quite warm, which does seem to counteract the soapiness. I've gone by the rule of 6 hours at room temp, 6 days in the fridge, 6 months in the freezer before the milk needs chucking.
You can express directly into the Pump & Save bags or the Medela bottles. You will need to transfer into another bottle (unless of course you're using the Medela teats, then you can just screw teat onto the Medela bottle). FYI, Boots own brand standard necked feeding bottles also fit onto this pump, and are a couple of pounds for 3, whereas the Medela bottles are about a tenner each
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I wouldn't bother with a bottle warmer. A Pyrex jug with boiled water in will suffice. Also, you may have to try different bottles before you find one your baby will accept, so a bottle warmer for one specific type of bottle may be a waste of money if your baby won't have it.
I would echo PP that pumping may not be the best idea in the early weeks before BF is well established. Plus you could end up upping your supply massively and leaky huge boobs are not fun!
I hated pumping to be honest, I found it extremely time consuming (sterilising, pumping, washing up...), I didn't get massive amounts (although I have a good supply), and my DD didn't like having a bottle (but would if I wasn't there). I did it because I needed to be away from my DD at 3 months old for a hen do, which was just one day, but I had to pump for ages each day for about a week beforehand to make sure I'd have left enough milk. After the hen I never pumped again! It's nice to get your DH involved in the feeding, but there are loads of other ways to get him involved (nappies, baths, burping, cuddling, fetching you cups of tea while you feed
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Good luck with your baby 