I managed to get the full set on a small live city that I was playing in. And had done some head-to-head comparing with the one I got built in beta.
Tomorrow Era vs Iron Age
• The Butterfly Building (main building) at level 5 on both cities gives out the same amount of the following: +10 goods (at 2 unique buildings connected), +4 forge points (at 4 unique buildings connected), +30 goods (at 5 unique buildings connected), and +10 forge points (at 6 unique buildings connected). The only differences between the two are the following: population and happiness (base amounts due to era differences), gold (base amount due to era differences), supplies (era based at 1 unique building connected), and medals (era based at 3 unique buildings connected).
• The Wildflower Meadow (sub building) on both cities gives out the same amount of the following: +10% supply boost (at 1 unique building connected) and +10% attack for attacking armies boost (at 2 unique buildings connected). The only difference is the happiness given (era based differences).
• The Daylily Flowerbed (sub building) on both cities gives out the same amount of the following: +10% coin boost (at 1 unique building connected) and +7% defense for attacking armies boost (at 2 unique buildings connected). The only difference is the happiness given (era based differences).
• The Sapphire Arch (sub building) on both cities gives out the same amount of the following: +4 goods (at 1 unique building connected) and +4 forge points (at 2 unique buildings connected). The only difference is the amount of medals given (era based differences).
• The Magenta Arch (sub building) on both cities gives out the same amount of the following: +2 forge points (at 1 unique building connected) and +9 goods (at 2 unique buildings connected). The only difference is the amount of medals given (era based differences).
• The Marigold Patch (sub building) on both cities gives out the same amount of the following: +5% supply boost (at 1 unique building connected), +3% defense for attacking armies boost (at 2 unique buildings connected), and +3% attack for attacking armies boost (at 3 unique buildings connected). The only difference is the happiness given (era based differences).
• The Snapdragon Bloom (sub building) on both cities gives out the same amount of the following: +5% coin boost (at 1 unique building connected), +8% defense for defending armies boost (at 2 unique buildings connected), and +5% attack for attacking armies boost (at 3 unique buildings connected). The only difference is the happiness given (era based differences).
At 7x6, it's more useful than the Classical Building sets I once had in beta that I had finally mustered enough courage to remove (and, plus it was an eye sore). However, it's way useful in my Iron Age city that it gives me a boost on my FP income to actively participate in 1.9 threads (for 3-5 positions that tickled my fancy) as well as a boost to my fighting through GE while I am working on my Zeus there. The population and happiness balance does help as well (as I had removed the basic happiness buildings from my city entirely). And, goods I got a nice head start.
In conclusion, this set is beneficial for those who are starting out and wanted a boost. For me, in beta, I just want something to look at while I am relaxing from a long fighting day through FoE.