Has Anyone Tried One of These?

Definitely this bowl form is suitable for folded flakes,and the price seems just right or even better, arguably these might be being produced in Spain

Yes, I've looked at these repeatedly. My guess is that these were done for some targeted market and there was an overrun or a surplus otherwise. I agree the rustication is factory made, but I think it will exude some charm with wear. It's a good brand, and your experience confirms my sense that these are good pipes. This is another illustration that with some patience, you can turn up some excellent pipes at truly reasonable prices. They may not be everything you want for your rack, but they are undeniable great smokers at a fine price. All newbies building a basic rotation should take a look at these. And anyone who needs a car or travel pipe.

That's a sharp looking pipe. I have heard of him, but I am not exactly sure who Mastro de Paja is. But, that rustication is very nice.

Part of the history of Mastro de Paja is here
According to a thread in an Italian smoker's forum, and through the miracle of Google translate, Mastro de Paja went through a bankruptcy auction about a year ago. Someone bought the name. Their factory was sold and pipes are no longer being made there.
It is entirely possible to produce a decent smoking, attractive pipe at that price point, particularly if, as I suspect is the case, a large outlet like SPC is able to avoid distributor markups.
Even prior to the current state of affairs, Mastro had its issues. However, their production when Giancarlo Guidi was associated with Mastro was on par with Castello IMO. Guidi started Ser Jacopo in 1983. Some periods after that saw absolutely gorgeous production, other periods saw poor finishing, fills, etc. It is possible to find Guidi era Mastros at very attractive prices. I have acquired a half dozen or so in the last several months, and I am sharing this information because I have enough.