Almot
If you are going to cut down one product to make another look better, at least get the facts straight. the Voc limit was never 40v. It started at 42 and was revised to 45v. I have seen it used for a pair of 150w 12v panels in series and believe it or not, it didn't die.
One feature the Eco-W has that your original Rogue doesn't have is reversed polarity protection. I'd rather replace a fuse than a controller if I suddenly became, you know human and made the mistake.
There have been 300w 24v panels out since I bought the Eco-W, had I know the Voc limit was going up, I'd own them now.
Now when I talked to Mark at Rogue, he didn't say I could run more than 400w because I could run any panel I wanted, it was because he never expected me to see the actual rated watts and that some clipping would be ok. MorningStar is who came out and said over paneling is ok.
Not only does the Rogue take more cash, it takes more room too. Compared to the Eco-w, the Rogue is massive.
Now since I am once again in the market for a inverter and at higher wattage 24v makes more sense, I can run both of my 245w panels on the Eco-w on a 24v system should I decide too. I'm not saying the Rogue can't, just saying the Eco-w can.
If I could add anything to the Eco-w, temperature compensation would be the first. Rogue would be in the running for the final install if they had a 40a model.
So for the extra money does the Rogue 20a have features the Eco-w doesn't, I'd hope so for nearly 3x the cost. It would also be a poor decision to but the Eco-w if you needed those features. That doesn't mean the Eco-w isn't a reliable, inexpensive controller if it fits the bill.