OT Query - Canon FD lenses/cameras

Hi, all,
I've just been given a Canon TLb with an FD 50/1.8 (Chrome ring and bayonet lens-hood, old style FD mount), an FD 28/2.8 (New style FD mount) and a Vivitar 75-260 / 4.5 Zoom (Old FD mount) + a Vivitar Automatic 2x Teleconverter ( [FL-FD] - whatever that means).
Having never used Canon cameras or lenses until the DSLRs came out, I was wondering if anyone could tell me anything about the quality of the above.
The TLb is fully functional (and very simple) but needs Mercury or Wein cell batteries - can anyone recommend a good alternative body (assuming that it's worth it for using the lenses I got) - I gather the A series are pretty good and the F bodies are apparently superb - any pros and cons?. 

Thanks in advance
Douglas

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