I started playing MC again and went straight for tekkit, and of course everything has changed since I used to play what is now called Classic. Then I kept reading and IC2 + RP gone ... doh. I spent a few hours looking for a video, a guide, SOMETHING that wasn't outdated (I guess even the wikis are not updated yet, well it is a different wiki now?). It was very frustrating but this has helped a lot. There is still a lot of re-learning to do. I really wish there was a tutorial series for the new tekkit setup but I am just learning about each mod as I go. Well at least I have found the working wiki for "modern" tekkit.
I am used to powering everything IC2 with solar panels and most of my time was spent making compressed solar panel arrays, but I am OK with having the new BC generators/energy system and I heard more generators are coming. I watched the video on TE and it does look to replace most of the core machines in IC2 with some nice interface changes like programmable input/output. I guess the powered suit will replace stuff like the electric drill ?
There are a couple things I have to re-learn how to accomplish. Pneumatic tubes + filters I used heavily in factories instead of the BC pipes because I had a lot of problems with BC pipes spitting out blocks when machines halt or overflow and sorting stuff. I need to check if additional pipes still includes teleport + diamond sorting, but I think the ME network replaces a lot of the logistical stuff now ? Totally new to me. It probably solves the issue of overflow. I really want a good logistics management system.
One thing I really miss is : http://thetekkit.wikia.com/wiki/Miner . There is a BC miner (http://minecraftbuildcraft.wikia.com/wiki/Mining_Well) but reading about it it only does 1x1 area and doesn't fill in after or recover the pipe (?). I guess that is like the starter mining device. The IC2 miner had up to 9x9 area but doesn't leave a big hole, it has a "cleaner" approach. The BC Quarry I saw the video on and has perhaps a better capability to define the area to mine, but then it leaves a huge hole. That is the only problem I have with it but it still seems damn convenient for strip mining (any way to cover it up easily?). Auto-crafting is also more developed so I look forward to playing with the ME mod.
I resisted the urge to just go back to Classic because all the cool stuff moving forward is going to be on modern tekkit. I just wish I had an overall guide or something.