If you have the spending power to afford a 730 why would you be even looking at an entry level phone?
It has firmware issues at present ( I have one) but it will be addressed, and probably already has pending the update/fix.
This is the first commercial batch so bound to have bugs/glitches.
A tech review site here in the UK had a handset from Msoft for a day to evaluate and they reported multiple bugs in the report.
To date only one has been addressed by the owning public and that one I can also clarify.
An update will be coming and a new firmware update will be shipped with probably commercial batch2 or batch3.
I bought the 535 because I'm tight and loathed to spend lots of money on a 'phone'.
I'm not on any contract as I don't agree with the concept of luring people into 2 year finance deals by dangling the 'shiny' carrot of a new phone only for it to become all but obsolete within 12 months.
I buy all my phones second hand, unlocked and stay roughly one generation behind the 'pack'.
This phone however is different, it costs a minimal amount of money to own outright without carrier lock, has 1GB RAM (a guaranteed pre-req for WP10), 5 inch screen, decent camera, processor, colour depth and black work for me pixel wise, has an equaliser for music playback (something that was a major tick for me being a music lover and ex sony walkman owner) so was a no brainer.
That being said, I'm under no illusion that this is any top end phone, it isn't, it's entry level with some specs that you'd normally have to spend high to acquire. It has a number of attributes that I think future proof it for WP10, 1GB RAM, Quad Core Processor.
It has limitations but to me they're not show stoppers and I'll own this phone for couple of years I'm sure as I have done with the 520.
If you're looking at at 730 then your desired tickboxes are higher than that being offered by the 535, lower your sights/expectations then maybe this is for you but I severely doubt it.