There is much debate about whether or not the differences in pro vs. senior, senior vs. bottom-end, smu, special runs exclusive to certain stores, etc., etc. is labour (North American vs. Asian) or the just quality of materials or both. I think the X24 is the top-line senior, so my guess is that the padding is not that much different from a top end pad from a few years back. Brian's claims their top end senior pad has 85% of the same materials found in their top end pro offering.
Knowing what I know about manufacturing, foam is the cheapest part of a pad. Of course when you are trying to meet a certain price point, everything gets dumbed down. The Jenpro-like material will be thinner, high end specialty foams will not be included (especially if it has a name that must be advertised, therefore paying the manufacturer to use the name in addition to the product), straps will be flimsier, etc., etc.
I don't think you have anything to worry about with your pads, as I am wearing used senior Vaughn pads (7470 V5) and they feel pretty much like a new set. I haven't felt shots in mine, and I've played in these 1-3 times per week since November in intense shinny (scrimmages, in reality). It's not like you have Bauer Reactor 2000, which are DEFINITELY a low-end pad (I have a set).
Many goalies I know wish for the simpler leg channels of senior pads when they buy pro and often strip them down to what a senior pad looks like in the leg channel! You may figure out how much you love the senior style leg channel!
Now, the only pad I would play in roller would be a low-end senior pad, as they are light weight AND relatively painless to drag across concrete (to a degree). I will be putting slick tape on my Reactor 2000 pads and try some roller hockey. I would only use them on ice in an emergency basis, as just getting my moves down in these broke them down quickly, as well as degrading the toe trims, though I hear this is a common problem with the Jenpro-like material used as toe trims on the Reactor line (save for the pro line).