OK well I too have an old K250 whose weighted action I like but is very noisy and prone to sticking notes with some channels failing, and is way too large to take to gigs anymore. Although I still have the K250 at home, for gigs I replaced it with a Roland RD-300SX 88-Weighted Key Digital Piano. The action and sound of this beast suits me fine. The keyboard is a litttle heavy to lug around, but works well.
Only other drawbacks I have discovered are that it doesn't remember settings like Local Control Off, or the Expression Pedal which revert to the defaults after you power the machine down and then back up. The expression pedal setting is particularly irksome because it doesn't default to Volume controller 7 as one would of course expect, instead varying 'expression' - almost imperceptible on many of the built in sounds. Also, the power supply is a non-standard Roland built device, so if you lose it, you're screwed and will need to wait for the factory part to be delivered (which they do fast, but at considerable cost).
This sort of thing has been typical of Roland for as long as I can remember - doing things their own sweet, non-standard way. I don't know if you remember its 'all-notes-off' command that would be sent every time all the keys stopped being played, thus rendering it useless as a MIDI input device unless you do as a friend of mine once did, sticky-tape down the bottom key so as to never have 'all-notes-off'.
I realise the above comments don't sound like I am barracking for the instrument, and I don't know whether a firmware upgrade is around to fix up these minor annoyances, however in every other way I have found the keyboard to be great.