IAS fluctuations are not official fluctuations and are regularly inaccurate and "under" what the official top fluc is. There is a bookie in Melbourne called Rod Cleary who wrote an article about Top Flucs Vs SP Vs Tote prices. His research apparently covered about 1300 Melbourne Metro meetings and relate to 10450 races. Quite a decent sample and very interesting reading. It's at http://www.vicbet.com/articles/default.cfm?id=9

I've only been betting with bookmakers for about 2 years but I could count on one hand the number of times the TAB has paid more than top fluc.

Sportingbet (formerly No 1 Betting Shop) allows you to place your bet at best odds which means you get the higher price out of SP or Supertab.

For me, nothing beats top fluctuation betting. The only disadvantage is having to bet at least 30 minutes before the jump.

Cheers