No complaints on Sport Dog here. Had the 1850 for maybe 15 years before it crapped out. Bought a 400 after that; still works.
But TGM has given a very accurate review of the Garmin 200i which I use now. Primarily because I have hunted 640s of 9 foot tall corn in SD and I like to know just what my dog is doing even if I can't see very much in there.
My solution for the bulkiness and screens was to buy a Garmin Instinct watch which links to the transmitter. I wear the watch on the inside of my wrist on my left hand, not the normal watch position in the picture. When holding the forearm up, I can see the arrows pointing to the dog(s) and the range to the dog on the watch face with a quick glance. Works well for me.
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No experience with the Sport Dog tracking collars though.