While researching potential new commercial varieties, I came across a report done by "Fundación Produce Sinaloa".
This is what they had to say about the Osteen, ( translated from spanish )
> Tree growth habit : Vigorous, dense foliage, erect.
> Fruit: Very Good,
> Season: Aug-Sept.
They considered this fruit as the best Alternative to Keitt for a late season type. and also mention that Osteen is Just as good in taste. with the advantage of being more attractive.
> Flesh is firm, which is considered an attractive feature for exporters.
When left to ripen fully Brix levels were taken, the Osteen actually had the highest out of the group they were testing.
Osteen - 20.4 Brix, compared with 19.4 for Palmer, and 18 for the Gouveia .
Personal note, I think these readings are pretty high, not sure if they were measuring rotted fruit , I have seen other Brix numbers for Osteen, at an avg, 14. which seems more reasonable.
Other good features of this variety, is good seed to pulp ratio ( 7.35% ) and low acid ( fruit had a Ph of 5.73 ) which was the highest Ph of the fruits tested which would make the fruit taste sweeter.
Production wise, from those listed it was only beat by Van Dyke.
Personal Note: I wish they would have done the trial using other popular cultivars for reference, like Keitt, Ataulfo, Haden. the mangoes in this trial were:
Osteen
Smith
Springfels
Palmer
Gouveia
Ah Ping
Van Dyke
One last note, they recommended the Ah Ping for early season variety.