I was looking at getting the mandalorian helmet from them originally. I do really like the company but wanted to explore other options to see what else was out there. Really like the Anovo mando helmet but have heard a lot of bad things about the company.
Vendors will depend on what helmets you want and what you want from the helmet. Some people want as accurate as possible replica of the prop and are willing to pay quite a bit to get that. Others want a reasonable looking representation but want to keep the price within a certain range.
For the Mando helmet the licensed makers are now the Hasbro Black Series, Denuo Novo, and efx. In general Black Series helmets are good values for the money, but are not accurate replicas of the actual props.
Denuo Novo took over the Anovos backorders and have certain helmets currently available on their
site. They started shipping late August. People seem happy with the helmets they have received so far. Denuo Novo hasn't been around long, but appear to be reliable so far.
The efx fiberglass helmet has some issues with cracks or wavy lines where they shouldn't be wavy. Some of their Mando helmets are fine, some are not. It seems inconsistent. efx also has a
PCR version. These usually fall between the Hasbro and fiberglass helmets as far as quality. efx has been pretty reliable with shipping PCR helmets.
The Black Series is the cheapest and people seem fairly happy with it, but it is more toy like.
The efx and Denuo Novo fiberglass helmets will cost over $700. The efx PCR helmet is $449. The Black Series under $150.
You can always check ebay for helmets if you don't feel comfortable ordering from the vendors. Many people order through well known reseller sites like
www.entertainmentearth.com or
www.sideshow.com.
For many OT helmets,
RS Propmasters is great. High quality and usually shipped in a reasonable time. But it depends if they offer the helmets you want. RS Propmasters tries to replicate the actual prop as much as possible. Their OT stormtrooper helmet has bumps and odd shapes in places, but that is how the actual helmets were. The Black Series stormtrooper helmet is based on the Rogue One helmet and is much cleaner without the bumps and odd shapes of the OT originals.
It is important to decide what you want the helmet to be (accurate to the prop or not) and how much you want to spend.
There are usually posts about these helmets on this forum. I would recommend looking at the photos and reading the posts to get a sense for how people feel about each company.