We've had customers mention a "drafty feeling" when the blower is running on low... My experience is that these complaints generally come from older customers, many who have switched from old oversized oil furnaces.
Plus side = operating costs are much lower and possible local or state rebates or tax credits.
the vs is not all that new trane was useing it in the early 90s
have put in a lot of them and had may 2 problems out of a 100 units. these were caused by dirty cheapm filters not being changed and the blower getting full of dirt and dust
very good and reliable motors