In your opinion, what are their best live performances?

it didn' t happen at the O2 but you know it right ? santa fe was not performed the same day as it's hard letting you go

Naahhh, I think some of these songs are kind of a Jam session, they are barely 1 min long.
When we describe sets nowadays, we dont split Roadhouse Blues for instance... neither Shout!

The sound quality from the 2nd night extras is just as good?? The Boot that I own dont have any extras

Funny it didn't feel short at the time though.

Best performance by the band? KTF era
Best setlists? These Days era

I think the band in general plays the best shows of any tour early on, and then seem to settle in a bit for the main run and then a few changes as they get bored towards the end. While there are certainly exceptions and standout shows that don't fit my broad generalizations, I would choose to see early shows in a tour.
Also it is really hard to judge the quality of early performnances (pre 1998 or so) as the quality of the recordings varies so vastly. Sure there are great ones out there but plenty of unlistenable stuff as well which makes a general comparison hard. Most of the great ones come from PRO sources which may have been "doctored" a bit prior to release.
The early Circle shows sounded the most musically solid to me of any I have heard since 93, but to be honest the shows we saw from from 86-93 were great from a young fan loving a rock show perspective and I didn't become a critical bastard till the horrible show in Cinncinnati 95.
Dave

Tell us more please ! I thought the 95 shows were amazing

From 88-95 was the golden period.

Anything else has been good but pales in comparison.

it was bad enough that even though my wife was the biggest Jovi fanatic I had ever met we decided to skip the cleveland show a few nights later and go to the zoo instead.
Jon sounded bad and seemed to be in a shitty mood as well.
we had great seats a few rows from the stage on Dave's side that night
Dave

If you balance the setlist against Jons vocal ability then I'd say the TD tour. Jon's voice was in it's peak in the early nineties but those setlists lack some amazing songs from the TD era. 1995 was probably the one of the last times Jons voice was consistently amazing.

KTF tour is the best because they had ITA followed by LOAP, which is very awesome.