Agreed.
The Porta One is one of three Tascam Portastudios (aka Ministudios) that run on batteries & features strap buttons for true field recording capability, (see: Porta One, Porta Two & Porta Two HS).
All the things AA said above are basically true. The Porta One is very well built and equipped for such a small model, that's comparable to other 80's tech in features.
The Porta One breaks out as much better than the modern MF-P01 & Porta 02mkII, with a much better mixer section, hands down. The Porta One is nearly comparable in features to the 414mkII only (Porta One) running 1x (normal) speed, vs. the 414's double (high) speed, & with 2-simul (not 4-simul) recording and real VU meters.
The Porta One would be a lesser design than the likes of the 244, or any other high end unit like the 246, 464, 644, 424mkII/III, which feature high speed, better EQ and 4-simul recording capability.
The Porta One is a nice little unit that's easy & fun to use. It's low end but handy enough and sounds better than it's modern counterparts, (MF-P01/Porta02) thanx to dbx NR. $80 for a well kept Porta One unit in full working order is a decent deal. It should give you much enjoyment in discovery of basic 4-track production, and should sound pretty good too.