Hello,
some of those are actually quite well established and very good brands:
- Santambrogio is one of the oldest Italian brands, the current pipemaker Stefano Santambrogio is the last of a third generation family business founded in 1912
I think he makes very nice pipes for the price they are listed for, and I personally like their rustication. I have a couple of them and are great smoker, for the price point a great way for starters. And probably after Stefano there will not be any other Santambrogio making pipes...
- Pascucci, there are actually 2 Pascuccis. You are probably referring to Mario Pascucci, he has been a leading pipemaker at Mastro De Paja for over 30 years. After retiring he decided to create his own brand. So his style is the classic Pesaro school style and very well made pipes overall. The other PAscucci is Andrea, also from the Pesaro school, he has been working for L'anatra and he recently took over the Fiamma Di Re brand
I have never heard of Manelli. It is probably a sub brand as they seem pretty cheap entry level pipes, I'd totally look elsewhere.
Armellini is another established brand, started by Mauro Armellini in the 60s and took over by his daughter Vilma after he passed away. Currently Vilma is producing pipes with his son.
Hope this helps!