S617 can't compare to s801 when it comes to standby time. Not by a long shot. Now, how will it compare in other scenarios? I honestly don't know.
And s801 isn't a mid/low range processor. It is a flagship processor. Last year tech for sure, but underpowered? Maybe. If you plan on using your phone as a part of a render farm
I found 0 lags on my OPX. Nothing.
Installed some games just to test it out, and OPX didn't even notice those while I was playing.
I simply don't see why you think that s801 is such a bad choice? Does it lag? Nope. Can you do everything that s810 can do? Yup. Is there real world noticable difference between the two? I can't find one. Except that s801 doesn't throttle like s810 does, and it doesn't heat up. I found OPX way more better phone then OPT. No lags, phone doesn't heat up (and it's completely made of glass!), and the screen is way better.
And this is a cheap phone. Premium built, premium design, works flawlessly. Now, if they were selling this phone for 500€, I would jump on 'critics' train and be all over them. But I simply can't find not even a single phone in this price range that offers everything OPX does. Of course, you can always find one example where some phone has better battery, other has better camera, etc. But in a single package?
I can't find one. If you can, please point me in the right direction