I installed SB 4 and it seems to be pretty good. I have been getting a strange error message (assertion failure) but I say ignore and it seems to go away.
[edit] I am not certain that this is coming from SB. I don't even know what an assertion failure is and I have been a programmer for 40 years. When I get it I am running MSFS, Radar Contact, SB and ServInfo so not sure which is causing it.
Also, the connection drops periodically. As I recall from using SB before that has always been problematic. It is not 100% but it is good enough to use.

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