The 758 is a sewing machine. That's all I can really say in its favor. It's nothing special, I didn't find it a great machine for usability (the dials turned harder than I thought they should, and the buttonholer was less intuitive than it could have been) The additional drawback (for me) was the self winding bobbin. They're often a problem point, and I prefer to wind my bobbins while I sew, rather than having to remove my work to wind. Self winding saves me no time whatsoever and encourages me to not clean the hook area enough because "you don't have to remove the bobbin".
I agree with the comments about the Singer 401, 403, etc, but also keep an eye out for a 411, 421, or a 431. They're German versions of the 401A. They're the same machines, but they also chainstitch.
Also, most of the pre-computerized Kenmores I've had come across my desk have been great machines, and very quiet compared to the Singers of a similar era. Great FMQ machines too, the ones I've tried.