Tech2 is the official £2000+ dealer tool that is fully supported by vauxhall and is what the dealers use. OPCOM is a cheap £20 interface made in the bedrooms of kids in china with pirate knock off software. The software is old and buggy with the pirate interfaces.
Vaux-com is available in the UK and is the supported legal version at around £700, software is a couple of new years newer than the clones and a lot more of the bugs have been removed.
No pro worth their salt should be putting an opcom on anyones car for money, with no support when things go wrong, it's not worth the risk and the "it worked on mine it will be ok on yours" brigade, quite simply don't appreciate how it is programmed.
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