I had the feeling that Gulfstar was a Canadian boat. My apologies, it is a US build boat as mentionned by more knowledgable sailors.
There are lots of pro and cons about this brand. I believe they are related more to specific models than the brand itself.
It looks like there are excellent Gulfstars boats, and some very bad. Here is a link to a chat you can check.
I'm the new guy - GulfStars
What I disliked about the boat I was on board last year was related to access.
The cokpit was nice, however a full enclosure made difficult to access in and out.
Difficult access to the engine and to be in and out below deck.
Difficult to move on deck.
I dislike when something is difficult. This is probably why I kept a bad souvenir of this boat.
I am not saying they are bad boats, it is not a boat for me.
Hope you will find the right boat for you.