I grow seedling pears. And am really really happy with them.
For my trees it took about 7 or 8yrs (from seed) before they bore any fruit.
But each year after the fruit load gets bigger.
I am at 43 latitude---south central Michigan.
Here's my story with my seedling pear:
I had long admired two grafted pears in a nearby neighbors front yard. I grafted scions from them and several of those trees are growing and producing just like the parent.....tho, after 11yrs they are a ways away from producing the volume of fruit the parents do. But they are producing more pears (big pears, too) each year.
Out of curiosity 12-14year or so years ago I cultivated seeds from the the better of those two trees.
THAT turned out to be a home-run.
Those half-dozen trees are a sure fire draw for deer each night from September until late January when the last of the fruit has dropped.
My fruit looks exactly like the fruit pictured in the OP. And the quantities are big now....and get bigger each year (absent a late frost).
With the success of those trees I have propagated perhaps a dozen or so more and they are in various stages of maturity now, tho none old enough to produce.
The caveat: They bloom early. In fact, my earliest bloomers of any fruit type on the farm. And thus they are susceptible to a late frost. I have twice had frosts after May 10th in recent years. They reduced the yield, unquestionably. However, it was not reduced to zero. Some trees are hurt worse than others. Probably a micro-climate thingy for their specific location. But even this year --2021 --- when we had killing frosts around May 25th/26th.....all trees still bore some fruit. And a couple are carrying heavy loads.
BTW, they have been easy to propagate from seed with the usual stratification protocols. They have been vigorous growers as seedlings. Better than any of my seedling crabs or oaks.