There are two main criteria to look for when getting a tape transfer deck:
1. Manual azimuth adjustment of play head. Requires removable front lid for easy access of the adjustment screw (or go for the few Nakamichi models which have a custom knob for this).
2. Three head design, to minimize interference.
(3. Obviously, the deck also needs Fe/Cr/Metal bias selector, and Dolby if your tapes were recorded with Dolby, but that goes without saying.)
Looking at the specs, your deck is a two head model, so I would put my money elsewhere for this specific useage:
http://www.thevintageknob.org/TECHNICS/RSM85/RSM85.htmlIt's a nice deck, but I wouldn't get it for tape transfers.