I haven't tasted a Celeste that impressed me, so it's interesting to hear that there are some out there that may be worth giving a shot.
Here is what I can tell you ....
FWIW, the local "Blue Celeste" at my neighbor's house a few blocks away has fruit which is approximately 1/2 the size of my normal BT. It has richness (whereas my BT does not), and the inside of the Celeste fruit was more tan-ish than the strawberry-ish insides of my BT. The Celeste fruit actually had some richness, and it was definitely sweet, but not cloyingly sweet like some of the overripe BT fruit I picked last season.
The homeowner specifically remembers that the tree was labelled "blue celest" when purchased decades ago, but ... then you must wonder if the tree was labelled correctly.
I can also tell you this tree is over 18-20' tall and wide with a trunk as big around as my thigh, and I was a skateboarder, snowboarder and surfer through my pre-teen, teen and early 20's, I still have hugely muscular thighs from it. The tree is out in the open with no protection. The owner took a stick from the parent tree and stuck it in the ground on a south-facing wall a couple years back, and grew it in bush form. The owner says the fruit from the bush very rich, and sweet, much moreso than the huge parent tree. Could it be due to the heat from the wall...or the bush form vs. tree form...or ??? Who knows... I plan to have her save a couple so I can try it, maybe it will change my mind about Celeste. To me, the Celeste from the tree in her yard has left me feeling like Celeste should be re-labelled "Improved Brown Turkey" ;)