This topic has been beaten to death so much.......Yeah, some guns blew up (not recently), some people got hurt. Very unfortunate for some people. I am sincerely sorry that it happened, I wouldn't wish that on anyone.
That being said, the government has shown in the past that it is more than willing to put a stop to unnsafe products if the need is there. Obviously, since all of the foreign made "trash" is still coming in, the need isn't there. I've seen way more recalls on guns for unsafe triggers, firing pins, etc, than anything for the "unsafe" muzzleloaders.
Shooting a muzzleloader is just like being a reloader for catridge arms. You have to control the amount of powder, the seating of the projectile, etc. You have to use COMMON SENSE. If the manufacturer of the gun says to not use a certain bullet, or powder charge, there is a reason for it.
Hodgdon recommends 100 grain max of loose 777. They feel anything more than that MAY cause unsafe conditions. That's why the 50 grain pellets everyone shoots are actually about 34 grains of powder each. Those 3 pellet loads are just about 100 grains. Just like reloading manuals have max charges, and some people keep going until they reach pressures, even if the charge is over the recommended max, some people use more 777 than the max from Hodgdon. Its a decision you have to take responsibility for. Yes, all of the big manufacturers say 150 grain max load. I would think that they all do tests with that kind of load (maybe even higher) in research. They do have to know if the gun can repeatedly take that load before they recommend it. Doesn't mean you have to use it. Weatherby has shot loads at 200,000 PSI trying to determine strength on their Mark V rifles. Doesn't mean you can shoot that kind of load all the time, does it?
Since companies like Remington and Winchester use BPI and Traditions to make their muzzleloaders, they must be pretty safe guns. These are U.S. companies that won't even put a decent trigger pull on their centerfires because liability concerns, and issue recalls all the time for trigger and safety issues. If there was that much of a safety issue with the Spanish guns, you can darn well bet that the corporate lawyers wouldn't let the Spanish guns wear those names.
I say that you should read the owners manual, shoot the guns, use common sense, and have fun. I don't use CVA or Traditions myself anymore, but I know many, many people that do. They are very happy with them. I like the T/C and Knight guns better, because I have had better accuracy out of them, and I do think that they are nicer quality guns. If you can't shell out the funds for those guns, then it's better to get a more affordable gun than no gun at all. If I couldn't afford T/C and Knight (and others), then you can bet that I'd still be using a CVA or a Traditions. Maybe not as nice, maybe not as much "brand glory" bragging in itself, but I'd rather brag about the experience and the animals any day.