Electric engine is only useful if you use IC2. Since I already dumped that... not so much. Biogas/fernenter... eh. Yea, it can be handy, but if you are still 1.5.x you have MFR for Biofuel and skip it all entirely.Can't dump Forestry: Electrical engine, biogas engine, fermenter, and probably a dozen other things that seemed like buildcraft parts.
Cropmatron from IC2 only adds fertilizer hydration and weed ex to all plants in its radius. Gregtech adds an auto harvester as well as the MFR harvester.I think I might have had it wrong earlier; I'm not so sure a cropmatron will harvest things. Seems a little ridiculous to have to supply it with so much and it still not be quite as effective as doing it the old way.
It's ridiculously satisfying to see golems running around doing my bidding. In a vanilla world I made a branch mine with branches on one side of the main tunnel and a minecart rail on the other with loading stations every 32 blocks. I made it so I could just dump the ores I mined into a chest to be loaded into my storage system up at my base and go straight back to mining, but I always ended up watching the minecart come down the tracks, load all the items, and scurry back off to unload them. My RedPower sorting system in Ultimate was even worse since I could see all the tagged items whizzing around to their respective pipes.MFR is probably the easiest. However, I like to watch one golem whack down the 2nd block while another picks up after him. The little guys are cute.