I bought a NH 7090 this year.  It's been on the market a couple years, figured they got the bugs worked out of it!   It worked great this year!  EXCEPT......the ejection.   It's slow....and I usually had to jerk the tractor forward to help the bale out.   It did get better after the paint wore off, but it's not like the 849 and the 853 I had.  Those would shoot the bales up the hill.  The BR780 I used for 7 seasons.  After the 1st year it worked great, just the 1st year was a bear, lots of engineering failures.

Twine:

I use plastic.   Sisal and biodegradable doesn't degrade fast enough for me (it usually takes 3-4 years in this country)  So I gather all the twine when I feed.  My brother feeds with netwrap.  He cuts the wrap, unrolls the bales and then picks up the wrap the next day.  Most of the time the cows have the wrap all balled up and cleaned off.  Works good for him.