I agree with a couple of points IAS and betfair or any online bookie offer the best option from the tabs, but i would be taking best odds rather then TF or SP tabs are hopeless with thier take outs.

If we want the best option betfair is it if you can get your bet on, atleast they won't ban or restrict your betting as most online services will if you are successful why do you think the tabs tried so hard to ban them instead of coming up with there own version.

I give it a few years before the tabs realise that this is the way to go instead of restricting punters they take up the challenge and introduce a version of betfair.

There is only a couple good points about the tab

1) large betting pools.

2) Almost unrestricted cash bets.

3) Easy of transactions if you use your home tab.

Yes in the long run you will be taking a lower price for your selection, but if you are successful and can make a profit does it realy matter because it is the profit thats important if you can make 15% profit from the bookies and only 9% with the tabs then double your staking to make more profit, atleast they won't restrict you.