@Sarius1997
I’m not so sure about swing, but it does provide a good advantage if used (that actually might be a good balance rule). If the dice are kind, the US getting most technologies on the second group of 6 are useful (with the exception of Radar). Heavy Bombers can completely obliterate Japan (they’ll be reduced to fighting on land, it would be near impossible for them to build any surface naval units once the US starts spamming them), and can cause quite a bit of trouble for German industry. Super Submarines, Improved Shipyards, and Jet Fighters are quite powerful as well, while Long Range Aircraft is really, really useful, especially in the Pacific (you can conduct strategic bombing raids on Japan from Midway or the Aleutian Islands with an air base). As Japan, I would not want to face a US that managed to get Long Range Aircraft and Heavy Bombers cheaply.
Most of these apply to Britain. The Soviets are too hard pressed to benefit from it, since most of the benefits are offensively based (there might be an oppotunity if Germany does Sea Lion though).
Generally speaking technology benefits the Allies more because they can afford it and exploit it more. Given the unpredictable nature of technology and their smaller incomes the Axis will find it much less useful.