Universal Lambda sensors

[Mr_B]

Looking for a new sensore for a Rover K-series engine and noticed they sell Bosch, own brand and a universal 4 wire kit which means you use the orginal plug. Being half the cost got me interested, but apart from the obvious re the plug, what's the downside to using one of these ?
Thanks

[Mr_B]

Not worth the risk to save £30. Bosch it is.Cheers