I looked into caliber conversion for mine to .38/.357 which I load a lot. It came out a lot cheaper buying the Lee off ebay because it uses the Lee dies I already had and caliber conversion is a couple of minutes. Just looking at the SD, I'd have thought more like a half hour minimum, LOL. All you do with the Lee is pop out the die holder, take off the plate carrier, and swap. Requires one allen wrench. Both machines have their quirks. Loading the primers in the SD is a bit more of a pain. The Lee's primer feed has its own routine, but if you know how to feed it, works fine. Just can't leave it alone until it runs out. Dillon has by far the best built quality, should for $250.
Ebay got all anti gun and no longer sells gun related stuff. So, if I get a caliber conversion in the future for the Dillon, I guess I'll have to pay full midwayusa.com price for it. However, I may convert it eventually to .38/.357 because I load more of that than 9mm anymore. I'd like to keep the Dillon set up for loading what I load the most because I prefer to load on it. It's more trouble free, less to watch as you crank the handle. LOL However, I'll have to reset the powder measure every time I change loads. Don't have to worry on the Lee, just swap the powder disc to the proper sized one. I really like that disc measure thing, quick, simple, and accurate. I do have an electronic balance now that will take some of the pain out of setting up the measure, though. Problem with setting the Dillon up for .38/357 is that I have like 6 regular loads for .38/.357 all requiring different powder charges and bullet seating die heights and such. Easier/quicker on the Lee press.