We've used a variety of tour companies but recently Travelsphere and found them good value for money and with good tour guides. We did South Africa (Sun City, Victoria Falls and Cape Town) and Australia (Perth, Ayres Rock, Alice Springs, Cairns, Sydney, Canberra and Melbourne). Have to say couldn't find fault with them and would certainly use them again. The others have been Thomas Cook(California & Arizona), Page and Moy (Prague, Budapest & Prague(not impressed with them) a specialist avaiation tour company (Germany) and the other two escape me.