The problem I have with the jet courses is it raises the cost of getting a low paying job. It's expensive enough to get that $18-20K a year FO job as it is. In fact, I couldn't afford it right now. The only people that really benefit from the jet courses are airline management and the schools. Management knows the person has seen all this stuff before, so they are less likely to fail out of ground school there by wasting training dollars. There are some that make the argument that they are concerned about flunking ground school, so they take the jet course to help them out. IMO, if you NEED to take a jet course to pass a 121 gound school at a regional, you're not ready yet. It's akin to paying someone for a copy of a mid-term or final so you can pass the class.
I hear the "well some 250TT guys are safer than some of the high time CFI guys." Yeah, that might be true. I'm sure some of the high time CFI guys are safer and better FOs than some of the other high time CFI guys in their class, and I'm sure some of the 250 hour guys are LESS safe and worse FOs than the other 250 hour guys in their class. It varies from individual. However, taken as a whole, I'd say the 250 hour guy doesn't have the experience. Not saying that ALL 250 hour guys don't, just on average. They have less time in the air, therefore are less likely to have "been there, done that." Depening on how the 1000 hour guys spend their time, they've had more time, therefore more chances for things to have gone wrong. I judge things more on how much PIC time a guy has rather than TT. At 250 hours, you're not looking at a whole lot of PIC time, though. I know you can log dual given as PIC time in a lot of cases, but I personally don't count time spent with an instructor as "decision making" time.