Friend,I suck big time as a sales man. I have a brand new ( used only 3 times, warranty etc) at YS, so at this time I should say wonderful things about the 620. But I won´t.

Sure it´s a fine machine, well built and everything. But with all due respect to different opinions, the 620 does not come even close ( to MY ears) to the R-09 in sound quality.
The R-09 is a much warmer and fuller sounding machine than the 620. Most important: R09´s recordings are very pleasant to listen to, not one or two times, but lots of times. If you have the chance to have both units in your hand, tape some shows and listen. You'll understand what I´m talking about.
The R-09 is not a perfect, dream recorder. I´m a lucky guy and my unit never let me down in almost two years. Appreciate the fact that I'm a fanatic, taping like 2, sometimes 3 gigs a week. So far, no problems with faulty jacks or battery door jams. Mind you, my unit once was submerged in a swimming pool, thanks to my 5 years old son. Works perfectly. But that´s just me. I know , like everyone else around here, that the R-09 has it´s issues, honestly.
That being said, I´m waiting for my new R09HR. Friend of mine has one. It´s way more solid that the R09 and seems that all the old issues have been fixed.Hope that helps.
Take care,
Your lousy sales man from Brasil