Ive been waiting a long time for the tech tree, and I am glad it is here. Its robustness leave a little to be desired at this point, however it is a good starting point and I know that Squad will be doing their best to get it to where they want it to be. Personally, Ive done pretty much everything in Sandbox mode, but being limited in career mode has made it a little more challenging. You try to do a lot more with a lot less, and there is a little more sense of accomplishment when you do it. I am not saying sandbox is easy, because it isn't, especially when you challenge yourself, but career mode adds a whole new level to the challenge.