The 50s have a real low gear ratio and a small spool. They don’t reel in very much line per handle turn but that is probably OK for Crappie fishing.
The eBay reels from Japan are air shipped so they have a reasonable shipping time. The stuff from China is shipped by boat and takes a couple of months.
I have been using Abu Black max for several years now. Good little reels for what I do. Not nearly as expensive a shimano products. I don't cast, everything vertical with pitching occasionally .