I'm thinking of upgrading my SDI C4 e-vario this winter in my DG-100. With limited space, I would be going for an 80mm one.

I've seen some different options, like the LX S80/S100 and Era 80, but fail to see many differences.

For what I do know from the cumulus-soaring.com comparison page is that the Era 80 has GPS built in, is IGC approved and has a built in backup battery.. Also, the Era seems to support 1 needle at a time, while the S80/S100 can do netto/relative/McCready needles at the same time.

Would you suggest one above the other? Any other features to compare that I'm missing?

Help would be appreciated!