TT are what we're stuck with as my son has problems wth his tongue even after a tie was cut (twice, actually). He has to combine the slowest, tiny baby easi-vent teats with anti-colic (thing down the middle) bottles, which you aren't meant to do as it slows the flow to a crawl. He chokes on anything else. The consultant told us most parents with severely tt babies end up with this bottle/teat combo. The flow is very slow, so the baby can control it well which is a real issue a lot of the time with breastfed babies, as the technique is different with breast (compress, suck) than bottle (suck, stop flow with tongue).
BUT: they are awful, awful bottles to use for ebm, because the white ring around the neck swells when warm, and as it shrinks down again as the baby suckles it becomes loose on the bottle. So the sodding thing leaks. This is not good news with ff, and a disaster with expressed breastmilk. If I had a choice, I'd can the bloody things. We have tried:
~NUK bottles with ortho teats (glass is obviously BPA free, so we use them to store milk in the fridge now)
~Medela special needs feeder
~breastflow bottles
~MAM bottles
None worked. But our situation is unusual, and I know a lot of bf mums here recommend breastflow (double teats, so the baby has to compress and suck - I found they leaked horribly though, and a lot of people reviewing on Amazon agree) or the special needs feeder which is supposed to encourage sn babies to bf, so is presumably helpful. Many more mothers find MAM is the only teat their exclusively bf babies will take at 5 or 6 months.
If you do decide to go with tt, I posted a 25% discount code on the code section. On the plus side they do now sell BPA free versions, which they didn't before Xmas.