i use IAS Superprice occaisonally and tends to be ok.
i havent compared it to Sportingbet Maxidiv......perhaps i should.
if i cant get set on IAS fixed for something nicely above supertab likely tote price, il revert to IAS SP and take the chance that it'll be even with, or slightly higher than tab odds. its the way i bet, so i am restricted somewhat...i bet late, and in comparison to tab prices.
i find across the board i can get +7% more often than not, sometimes 15%, if doing real well can get 30% extra. occaisonally i make the wrong call and end up with tab odds (or fix at less than what tab offers at the jump), but this is rare.

dont really have many other choices i think apart from betfair. but...i cant use Betfair as am in WA (the richest, yet most nannied backward state in the world). my life would be far simpler if i could, and would suggest this is your answer really.
so anyway..i havent really offered many great options....but i have at least motivated myself to sort out a wa tab account (sometimes the fixed price is substantially higher), and a sportingbet account...so thanks.