I have an SDB set up for 380 ACP.
By my preferred method of loading, I separate the sizing process from loading so the SDB only does the loading. Shortly after shooting the ammunition, I size them on a Hornady L-N-L, then they are cleaned and put away for a future loading session. Small batches of cases resize quick on the Hornady.
I prime off the press. Dillon primer system and I do not get along.
I have the extra small powder bar for the powder measure.
The 380 ACP case is short enough that you can easily see in the case to make sure powder has been dropped.
The SDB works fine loading 380 ACP. Even with my apparent inefficiencies, I can load lots more ammunition than I can shoot.
My main complaint with the SDB, as the cases get longer, it gets more difficult to verify powder has been dropped in the case. 45 ACP and 9x19 are fine but I found 389 Special cases are too long. I have three SDB's one each set up for 45 ACP, 9x19, and 380 ACP respectively. I change cartridges by swapping out the entire press.
I have a cartridge change kit for 38 Special which now sits unused. They are not difficult to change, I just have moved 38 Special loading back to the Hornady L-N-L.