Louise, I was the same and my op was 21 Dec so by the time I found this site 2 days after op and realised I should have bought a macom, they weren’t posting out until 6 Jan, so I never bothered. From what I can gather the macom is more comfortable tho I can’t compare and I may have been just as uncomfortable with one. Lots of girls on here swear by M&S sports bras and asda ones too though so don’t stress too much if you don’t want to fork out yet more money. If you do decide to go for it – there’s some discount code you can put in I think.
I wish I’d had the macom, in case it had been more comfortable over my incisions so my advice would be, if you can afford it, get one ordered and at least it’ll be with you within a few days PO at the latest. And, depending on your surgeon, if you’re strapped, you may not need a bra straight off, or the bra will be over the strapping.