Have you read? What do u think?

>I will introduce some features that will help BearShares cluster >themselves together.
>
>Ultrapeers will only help a little in the current implementation, >because it is totally LimeWire compatible.
>
>I was just thinking about the problem, and it looks like we have >to make our Ultrapeer implementation BearShare-only, so that >we can group the Bears together.
>
>Unfortunate but necessary.
>
>This will let us do some other cool stuff too, like an >ultrapeer "connect-back" feature that determines if you can >accept incoming (with 100% accuracy).

Written by Vinnie on Bearshare forum

It's OK, it won't hurt LimeWire users, there are enough LimeWire ultrapeers out there, and LimeWire users will still be able to download from Bearshare users and vice versa.