Upgrade offer to bifacial panels

Solar Bureau (via Solar Together) have offered an upgrade from Aiko 445w Panels (15 year warranty) to JA All Black Bifacial 445w Panels (25 year warranty)

Is there any point in bifacial panels on a roof installation? The longer warranty is nice to have.

They're also offering free bird protection (worth £630)

The existing quote is in this post: https://www.reddit.com/r/SolarUK/comments/1nwvreb/quote_check_18_panel_battery_system/

I had decided to reject it and get more quotes in the new year. I'm not sure these upgrades change things enough to alter my decision.