I like pentax. i got 2 of the light seekers. I've got all kinds of scopes simmons,bushnell, tasco, bsa, and i'm sure there are others. i use them all and they all do the job. the light seekers are the clearest and gather the most light but they were also the most expensive. between 450 and 550.
look at it this way even the less expensive scopes are far better than the scopes of old. the redfield was top of the line in its day and most every scope out there is clearer and has better light gathering capabilities.
free is a great deal. i still use the tasco i got back on my 243. no problems.