T trades is just margin trading on borrowed money - closing deal before you have to pay for it.
I T trade tiddlers on T10's sometimes. Only really if I am fully invested but really think some news is going to sky rocket a share.
THe downside is stamp duty - if you are looking at bigger stocks FTSE350 then much better spread betting or CFd'ing em as you save the 0.5% stamp duty.
Generally I would only T trade tiddlers that you cannot margin trade elsewhere. If you have not got the cash to buy the stock in on settlement day you have to sell something or take the hit and re-open the deal paying the spread again in the market. You can get screwed big time if you over trade on T's and then end up having to close good stuff to balance the books and run the crap half the time.
Can be very rewarding but not without risk like everything else
