Used RW in the wayback. Keep it installed for nostalgias sake I guess since it was the first form of non game coms back in the mid 90's when our roots were planted in online flight simming. Its past its prime, but works just the same.
Over at debdenboys, we looked at Ventrillo as we are always looking for something better if its out there. We found that it worked good if it wasnt heavily populated. Some nights we have 20-30 folks on one channel, and Teamspeak simply handles the higher player throughput at the higher quality codecs much better...hands down. Most people who do not like the quality of teamspeak either are trying to run it off of their home system , and dont have the bandwidth to do any voice proggy justice , or don't know to adjust the codec settings up and how to properly configure it. Best advice I could offer is that if you have a group of people, rent a TS server from someone like clanservers (50 player for 17 bucks a month with unlimited codecs). Most , like Clanservers, have a clanpay option whereas anyone can donate directly to the server fund via Paypal (please ignore most of the baseless urban myths about Paypal as well, I've done literally thousands of dollars without a hitch with it over the years), and the money is directly applied to the server fund. This way you can split the cost among the group.
If your going to run any voice program from your home PC and not rent one, bottom line is you should have at the very least a cable connection. Anything else will give you nothing but grief. Been there , done that.