Hi Speedy,
I'm not familiar with the Philips N4520, but the features sound interesting.
Here in the states, Teac/Tascam were the brands that "serious minded" home recordists went after, if they couldn't afford a Revox or Otari.
The Akai units didn't last as long, and seemed to be a little on the crude side.
Dokorder was popular for a while, but the brand seemed to dissappear within a few years.
Revoxes (Studer) are GREAT machines... built to last forever. About the only thing you'll ever need to replace are rubber parts (pinch roller, belts, etc.). They were built on cast metal frames too, which helped keep the machine in alignment. Many Revox 1/4" 2 track machines are still in use as mastering decks. If you can find a good Revox 2 track high speed unit for $200, it's a great buy!