A tool which fully encircles the bearing housing is better. The ones which only go three quarters around can "spring" apart under extreme force.
Best tool for the money is probably Pedros' socket tool.
http://www.pedros-europe.ch/Pedros-Euro ... _Tool.html
I use one at the shop which I bought as a stop-gap until there was money for a more heavy duty one - and it cost next to nothing. There are nicer looking, harder wearing tools out there - but honestly - how often do you need to use it?
While you're at it - for square taper and ISIS/HTII the BB socket holder is pretty handy too.
Completed: 94 Stumpjumper w. M733; ; 92 Dave Yates 731 ; 97 Parkpre Pro-Elite ; Pace RC200 F6 ; Pace RC300; 82 Gios Super Record ; 97-8 De Rosa Giro D´Italia; ; Banani SPX Track bike ; 89 Alan/Mavic Cross Bike ; 05 Focus Cross Team ; 90 Look MI-80 all-Mavic ; 12 Focus Izalco Team/custom build ; 11 Focus Thunder Custom build
Projects : , Brouwer all-Mavic
Stripped : Pace RC303
Gone : GT Karakoram
Stayed in the family: Kuota Kharma, 04 Stumpjumper FSR
Ceased to be : Dynatech MT3, killed by corroded seatstays.