Water usage - fair enough - but the top-load washer will probably use as much as the combo anyway. My late-90s Bosch condensing washer-dryer combo hasn't had major problems deriving from it being a combo - the PCB died, but then so did that on the near-identical washer I had before. Shock absorbers seem to lead a slightly tougher life as the drying impeller fan and heating element are on top of the drum, but then that obviates the need for a concrete or cast iron ballast saddle, so when I get round to repairing that machine, it's getting new shocks - but then it is 20 years old or thereabouts (I got it secondhand a few years ago). The impeller fan also tends to get a bit lint-clogged and thus needs cleaning (the fluff removal programme isn't really adequate) - mine ended up falling apart, I've got a replacement awaiting fitting - but again, the original lasted nearly 20 years with no maintenance, so I'm not complaining. Once I've got the machine back up and running, I'm going to take the lid off and open up the drying matrix to clean it out periodically - I'd advise your sister-in-law to do likewise with her LG machine. Some sensible basic maintenance should enable it to keep going more-or-less forever, assuming the main drum bearing doesn't go in the interim (mine hasn't, and I have the whole drum assembly and bearing from the previous Bosch to drop in should I ever need to).