Hi:
I like the crimp on BNC's myself but the solder kind are OK. The twist on RS
ones are probably OK in low frequency low power but I wouldn't trust them
myself. In fact, I wouldn't buy one except in desperation.
Your concerns are the same ones I have. As I can buy Amphonal crimp BNC's
for $1.85 each anywhere, I would invest $50 in a crimp tool and go that
route.