Well except that new ones are much, much cheaper to run and don’t dump damp warm air all over the place.
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Of course depends on where the exit point is 
Its one of those conflicts, like throwing away incandescent 60-100w lamps to fit LED, sooner you start the savings begin.
That’s how I understood it too. Shortest horizontal run - output vent is normally lower corner
Always difficult to do comparisons - looking at ao.com (I am in the in the UK after all) one can pick up a heat pump model as low as £349 which is not actually that much more that the cheapest traditional model of the same size (which is £279).
Savings depend on how much you use it, ao reckon 585hWh/yr for the normal model and 295kWh/yr for the heat pump (2 and a bit loads a week, roughly) - saving 290kWh a year. If you are on tariff bleu that’s just shy of 73€** or £61 so you’ll have to be using it for slightly over a year to break even.
Of course if the equation is existing machine = £0 additional layout vs new machine=£350 layout then you will have to hope it doesn’t die in the next 5 years and 9 months (approx) to make a “profit”. Given that tumble dryers are not famed for their longevity this might be a stretch too far.
Which is why the the move to “greener” solutions is doomed in the short term (and therefore perpetually doomed in the long term).
**: I know I know, comparing English apples and French onions - but EDF prices are easy to find and apply to the whole of France. Would that were true of UK electricity prices.
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Lets not forget the cost of putting a hole through the wall and making it look nice.
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