Are Necron Nebuloscope’s worth upgrading Tomb Blades with?

A quick break from the recent Tau postings as we look at the Necron Tomb Blades with their twin-linked Tesla carbines. Reading through the Necron codex for the first time I was really interested to see that the Tesla weapons that many Necron’s have cause an additional 2 hits for every 6 they roll To Hit with. Sounds pretty wicked...