Really, really fabulous - and so easy! I used light-tasting olive oil (avoid Extra Virgin Olive Oil for mayo as it's too strong tasting and often results in bitter mayo). I just bought avocado oil so may try that next time. This was SO good, I immediately had my husband taste it and he thought it would be awesome as a dipping sauce (ie, for fondue). It has an aioli feel (from the garlic). The only thing to know is that the basil turns brown by the next day. Still 100% fine, but not as brilliant-looking if serving to company. Given how easy this is with an immersion blender, I'd rather do fresh, smaller batches the day of if you're concerned about presentation. It doesn't affect the taste though. SO yummy!