I have an Eon steel with around 400 dives on it and I'm not affiliated with Suunto in anyway, so take my comments as a user's observations.
The Eon Steel is heavy, I do notice it if wearing a rash guard, and it's weight is a little uncomfortable. 3mm upwards its fine.
The Screen display is as good as the picture. I dive it in the Middle East and it's readable in the bright summer sun (without sunglasses). Even having my screen set to max gives me around 33hrs of dive time before recharge (I never leave it that long)
You can have 3 varients of screen display, the graphical, the classic (just numbers) or the new one introduced with the core firmware update - I forget the name) By contrast the Perdix display looks positively 90's with its graphics (although a huge step up from the black text of other computers.
I'm not getting into the pro's and cons of algorithm, however I will say this (
@scubadada ) I have carried out real world repetitive dives over multiple days with people using the Perdix (All on nitrox, generally to the 40m range) with the Eon set to -2 (most liberal) and Perdix set to it's most liberal in Rec mode, the Eon consistently has more NDL time
I don't engage in proper technical diving, I'm limited to 50m max, and prefer not to make long deco hangs - again I've not been limited by it. I have yet had a Perdix alongside it for deco.
The OSTC is a fine computer too. I'm waiting to get my hands on the OSTC 4 for a play, but the OSTC plus has a nice screen too.
Here in the Middle East, again the Eon and Perdix are competitively priced, however the Perdix needs shipping to the UK for repair whereas Suunto have an efficient centre here