I won't get mad at you just for offering a stackable, but I sure will if you deny me the right to buy a GOOD PLC because you're building stackables instead.
Now I've heard that stackables are less expensive to build, but we're going to take the country of origin into account when comparing alternatives, so if it costs you a little more to make them in Tennessee than an equivalent Chinese product, that won't necessarily rule you out. We derive our incomes from US manufacturing, so we'd be idiots not to support US manufacturing. I don't buy PLC Direct stuff primarily because of the cost, although it doesn't hurt. If I didn't like it I wouldn't buy it. If a particular project is a better fit for Allen Bradley or Siemens' capabilities, I put the money for that in the quote.
Case in point: You may ask if I truly prefer to buy US products and am not exclusively driven by price, why don't I buy Allen Bradley instead of PLC Direct. Well, they never had anything competitive with the 205 in terms of points/ rail inch, points/in^2, points/in^3, points / module, and types of I/O available. You say they have the Compact Logix and Micro 1200 now. I say they're stackable (and ugly). I'll take the Chinese modulars, thank you very much. (And at one point most of AB's low end stuff was non-US anyway. I don't know what they're doing now, but I presume it hasn't gotten any better.)
Oh, that's another thing. NO beige plastic or softly rounded surfaces! It should look like industrial control hardware, not an answering machine.