While a lot of such a decision surely comes down to personal taste, it remains a fact that the YMs have more parts support in general than the Fs. Will someone likley start making high-demand parts for Fs eventually? Probably. But remember, just like with the YMs, it will be model by model, and there will have to be a high enough demand for the part before someone invests in it.....simply having x number of a given model in the market will not induce someone to invest in any given part. There are nowhere near as many parts available for some YMs as others. What an aftermarket producer will invest in is going to be determined in great part by estimates of the number(s) of a model in the marketplace, and documentable demand for a specific part. The F15 will never approach the YM1500 for volume. Not in my lifetime, and I anticipate I might have another 20 years. The F15 will not approach many other F models, so unless it has a lot of interchangeability with other F models, it could be a problem a lot longer than some models. I do not have the experience with Fs to know what the interchangeability---if there is any--might be.
With all that said, it is possible---maybe even probable---that if one gets a good unit to start with there might be no significant part needs for years. It's also possible one might need a part in short order that is either unavailable or very difficult (translation--pricey) to get. I just tend to play the odds, since I have to answer to customers. I would get an F15 for someone on request, but won't stock one on the lot.
