Important caveat: My experience limited to only 2 suits made about 2 years apart from two different tailors.
The quality is passable but not great, but considering the lower price, I've been happy. On the second occasion, I asked for some specific features which they never quite understood and in the end didn't deliver accordingly. I figured out what the problem was. The tailor who takes your measurements does not do the tailoring. He passes on the key measurements to a subcontractor. With such a production chain, they are good at handling the basic measurements and features, but ask for any variations and they get mighty confused... or lost in translation between shop and subcontractor. So I smiled and accepted the "standard" suit/cut they could produce and got my special suit made in Singapore instead (at 3 times the price). Of course it now means that I have one more suit than I need.
(I also suspect that if you have a non-standard body shape, they may have similar problems coping.)
I have no experience asking for heavy material.
I've forgotten the price range (US$100?) The shops put their prices up front ... but beware, that's for suits made of the cheap material. Shop around and ask for a more precise quote.
Yes they can do it in three days (I think it's the minimum), but as I mentioned... don't expect them to handle special requests if you're relying on the production chain method.