The benefit of EID tags is the ability to read them with an electronic reader and then quickly upload the data to an electronic device. If that ability would greatly benefit your herd, then it may be worth it. However, if you are running a 100 head herd, it probably won't be that much of an improvement, if any.
To read the EID tags, you will need to buy a scanner and the cattle will have to be caught or run through an alley whenever you want to read the tags with the scanner. There likely aren't any other real benefits, unless you participate in a program that requires them. They would be overkill on most feeder calves, which often don't require any official identification for travel.
Biggest down side of the tags is they are hard to read if you do it visually without the scanner. They have a 15 digit number printed on them, which I think is much more difficult to quickly read in a chute than the standard bangs tag or silver ID tag. Ultimately, most producers use farm tag numbers for their personal identification and record keeping needs rather than using the official ID, since official ID's are so much more challenging to read.
