EE is something that is a really fun SSP mod but it's really bad for SMP. Once you have a DM Hammer you mine 5x5 tunnels along diamond level and essentially have unlimited EMC. In PVP it's broken because the tools break protected land (i.e. Factions, World Guard, Lockette...) and many server owners disable it for this purpose. EE in combination with many Tekkit aspects also is riddled with bugs. Crafting Table II (Possibly III but I don't know) had a bug that let you dupe Diamond picks, then you put the picks into the tablet and make diamonds. The divining rods basically give you x-ray vision, your tools never break or lose charge (Since it's sooo cheap to replenish EMC) and one trip to the nether will provide you with enough EMC for the tools needed to mine fast and just explode with EMC.
On EE servers my faction can get 50 diamonds in the first 30 min easy, legit...so yea it's broken as hell. Now I will of course use ever tool available to me on PVP servers because everyone has the option.