I have been a fan of DW revolvers since I bought my first one in 1976. But the only use of a 15" barrel is steel shooting at 200+ yards and no holster is needed.
As for normal revolver use I am sure most guys could shoulder and fire a rifle faster than your revolver and carry it more comfortibly. You say it shoots well?? Whats that mean, What kind of 100 yard groups do you get. 3 to 4 " is very possible with a regular 8" barreled 357 mag.