Depends what you are looking for! It's not, far from it, Tamiya quality, but I think you'll be waiting a loooong time for Tamiya to release, say, a Saab 21, a Dassault Ouragan, a Dewoitine 510, or a 1/72 Concorde...
Back in the 80's their kits compared favourably in terms of details. In fact they were well above the other 'cheap' manufacturers such as Airfix and Matchbox, and in many cases, their latest releases offered much more than the then already expensive Tamiya or Hasegawa kit, in particular in terms of cockpit details.
Seen with today's eyes, of course, you'll find that those kits have raised panel lines, limited undercarriage details, the fit just about OK, and instructions that are not easy to work with.
Since the merger with Airfix, more recent Heller kits have become better, but have not followed the quality curve of as contemporary Japanese kits. The very latest kits are supposedly closing the gap a little....