No experience with ALT, but mine was done with Jeremy. I had a couple of other experiences with smaller so called "old school" houses which I can only extrapolate to ALT's style.
Jeremy was very knowledgeable, patient and most importantly to me, was willing to share on what might or might not work on my piece. This is because I was pretty apathetic to this all and would have just followed whatever a tailor will say.
This was exactly what happened with a friend's suit which was done in a tailor at 1U and the result was this:

A fused piece with that being told is the appropriate length, refusal to do working buttons and the advise that one should button all the buttons when your photo is being taken. It cost him more than 2k.
Looking back I'm pretty grateful for JT's guidance and his perfectionist view on his pieces because the flexibility and knowledge meant I was able to consider the pro and cons of a certain cut (i.e. advantages and cons of having pleats) then decide which to go for. He was also quite willing, if not extremely interested to try on the more unusual or interesting style that I'm not sure if ALT would offer / agree from the past stories I've heard.
If you're a deadbrain at this like me, would recommend Jeremy's.