After being crammed into an RJ DFW-Milwaukee, my rule is no RJ flight longer than one hour. Nothing against the RJ and their manufacturers, but the airline "let's see if we can squeeze in another row" and application of RJs to longer routes does not make for a pleasant (or even bearable) travel experience. I'll gladly take a connecting flight to avoid the "little jet experience".
Now if we could just get those MD80s replaced with shiny new 737s or 320s!