This post sums up what is new about the Garmin Edge 1040 vs 1030 Plus, so you can make up your own mind if the upgrade is useful for you.
Garmin Edge 1040 (with Solar) In-Depth Review
Garmin Edge 1040 vs 1030 Plus vs 830 vs 530 Bike Computers: In
Garmin Edge 1030 Plus vs. Edge 1040: Should You Upgrade?
Garmin Edge 1040 vs 1030 Plus: What's the Difference? • Average
Garmin Edge 1030 Plus vs. Edge 1040: Should You Upgrade?
Garmin Edge 1040 GPS Cycling Computer with Solar
do NOT upgrade - Garmin Edge 1040 Review
Garmin Edge 1040 (with Solar) In-Depth Review
Garmin Edge 1030 Plus vs Garmin Edge 1030. What's the Difference
Garmin Edge 1030 Plus vs. 130 Plus - Premium vs. Budget Bike
Garmin Edge 1040 vs 1030 Plus vs 830 vs 530 Bike Computers: In
Garmin Edge 1030 Plus vs Garmin Edge 1030. What's the Difference
do NOT upgrade - Garmin Edge 1040 Review
Garmin Edge 1040 vs 1030 Plus: Right Now I'd Buy THIS One
do NOT upgrade - Garmin Edge 1040 Review