I don't have that particular model of pressure limiter (mine is a Watts) but our plumbing fittings over here are different from yours as most domestic plumbing is either 15 or 22 mm pipe, so the model I have won't be available to you anyway.
However, Honeywell is a well respected brand at a bit of a premium price, and should be good quality. You really do want one that you can fit and then rely on for a long time.
I think the coffee machine suppliers can get away with fairly high prices for what they supply as many of their customers will just automatically buy from them with the machine.
Like you, I much prefer brass fittings to plastic (possibly for no legitimate reason !)
As it has a port for a gauge, I'd definitely get one and fit it anyway. They aren't expensive.