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Silver buffalo berry (Shepherdia argentea)
(Common names include: silver buffalo berry, bull berry and thorny buffaloberry)
I have not seen this one in flower. The two times I have seen this plant were in the fall when it was fruiting. I enjoy the berries quite a bit and wish they were easier to harvest. Had I tasted them this last time while harvesting I'm sure I would have stayed longer to harvest more. Perhaps I'll head back up there for more of them. 
My Experience
I did not find them bitter but rather found them to be sweet with a slight dryness, though not as pronounced as Chokecherries. They offer more meat for their size than the chokecherries do.They have a much smaller pit when compared to the Chokecherry and their color is bright red when ripe. Personally I would say this is a prime snacking berry and a great one to store dried or frozen or to make into jam, jelly or fruit leather. 

I have not seen a lot of this plant in Utah. In fact, I have only found it in one location on the Alpine loop. it is on a hill next to a parking lot for a trail head just after the Mutual Dell campground. The Silver Buffalo Berry is likely found more abundantly in central north america but can be found scattered in the mountains as far south as California and New Mexico. It has been used as food, medicine an die by native Americans. Personally I think that the flavor and texture you will experience and your reaction to it will depend on how conditioned you are to the processed, over-sweetened foods we generally eat today.
I'll include links to resources for this plant and a description from Wikipedia:

Shepherdia argentea is a deciduous shrub growing from 2-6 metres (6.6-19.7 ft) tall. The leaves are arranged in opposite pairs (rarely alternately arranged), 2-6 cm long, oval with a rounded apex, green with a covering of fine silvery, silky hairs, more thickly silvery below than above. The flowers are pale yellow, with four sepals and no petals. The fruit is a bright red fleshy drupe 5 mm in diameter; it is edible but with a rather bitter taste
Additional info and resources

Typical Buffalo berry leaf