I'll revive this subject again because I believe it is what LimeWire was intended for. On the subject of ultrapeers you are connected to, I have found most peers using Phex are the best contributors for music and cabos are the worst. I also try and block off all 6346 port connections. I've found .nl, .lt, .de, and most northern european addresses are usually into music when peeking into their files. I have noticed a few new types of addresses lately and would like to know what they are after. Like the amazon addresses for instance. They don't allow you to browse their files. Are all the "gtk-gnutella" clients after videos I am wondering? Anyone have any ideas? Now since I am using 5.5.10 I have to be choosy because I can only carry 3 peers at a time.

I'm not sure how to answer your question. Nor do I really have any advice on your topic.
I've noticed a few of the same things myself.
As poor as LW is at browsing hosts, there are some program clients that can disable being browsed. GTK, Phex, BearShare, Gnucleus from memory. I guess it's not really a level playing field when they can still browse other hosts.
I've noticed the Amazon hosts for a while but have no idea about their service or kinds of persons that use it, other than they offer a cloud service. It's my guess they are somewhat firewalled, but I might be wrong.

Someone else might have some advice on this topic?

BTW do you find that you get browsed as soon as you startup LW? Is it the Amazon user? I had not used LW for a while & was browsed immediately by them. I had previously searched their ip before. I did not wish to say above I was a little suspicious of Amazon users. There are hosts that browse people robotically as soon as they enter the network. They are Bots in many cases.
In this case they are identified as IndigoSnipe.

There was a couple such Bots in a similar ip range.

That's good to know, I'll keep an eye out for that.
To answer your question, I rarely get browsed. It's probably the speed of my internet connection. But when I do I check it out and so far none have been from amazon users. The first thing I thought of when I seen amazon come up was video sharers (since they now have a service for their buyers club) This is new so I thought I should ask you. I get poor results on music searches when these guys take one of my ultrapeer spots, so I dump them. Lately the results in general have been poor but with your help I have staved off #6346 (my main nemesis for years). I think it might be a good idea if somewhere on the forum we might put a ball-park type list of types of peers for better music searches? For instance we could put CABOS as a bad peer and now maybe amazon? Just a thought.