Hi --
I use the date on the MIDI Implementation chart as the approximate date when Yamaha froze the initial software implementation for a model. The SX700/SX900 date is "June 2019", so the initial software implementation is about 3.5 years.
Like second-guessing Apple product releases, only Yamaha know. Some Apple buyer's guides rate individual products according to a scale like:
- Buy now - Just updated (green)
- Neutral - Mid-product cycle (grey)
- Caution - Approaching end-of-cycle (yellow)
- Don't buy - Updates soon (red)
I suspect that the SX700/SX900 are at least neutral, possibly caution.
Patience is a virtue. One question I ask myself, "Is there any musical goal that I cannot achieve with my current instrument?" That answer is usually, "No." Saves a lot of money and needless self-inflicted frustration.
Hope this helps -- pj
P.S. Maybe we should adopt these kinds of ratings on the forum?