I made the mistake of using the SP3 as a tablet first, laptop second while it should be the other way around.
Between the UX305 with 8GB and the i5 SP3 with 4GB of RAM, the UX305 might be the better choice. 4GB is not enough for W10 with the way it handles RAM. The "system" process alone would use more than 1GB of RAM.
Also, AFAIK the Core M is about as powerfull as the Haswell-Y in the i3 SP3 so it should still be powerful.
As for battery life and heat, I think the SP3 handles them well. I can go two days worth of classes between charges, and the heat is about as much as a modern smartphone when gaming [except for the fan noise, which is noticeable but not annoying.]

Definitely i5 if you want to do productive stuff.

Core M only good for normal usage, both got pros and cons.

I never face any absurd heat problem with SP3, battery life is way better than normal laptops.

Core M will easily outdated in a year or so. i7 & i5 can hold up longer.

Guys, lazada is taking pre order for sp4.

http://www.lazada.com.my/pre-order-microso...et-5024038.html

however, the keyboard is still nowhere to be seen.

Found this great deal
Anyone buy from this guy before?

http://m.mudah.my/view?q=Surface+pro+3+i5&...&ad_id=41500650

Wow, didn't realize it. who wants my sp3 keyboard? Gonna buy this!

Surface Pro 4 prices (not sure if this is official):

Intel Core M3 / 4GB RAM / 128GB Storage – RM 3,999
Intel Core i5 / 4GB RAM / 128GB Storage – RM 4,449
Intel Core i5 / 8GB RAM / 256GB Storage – RM 5,799
Intel Core i7 / 8GB RAM / 256GB Storage – RM 7,099
Intel Core i7 / 16GB RAM / 256GB Storage – RM 8,049
Intel Core i7 / 16GB RAM / 512GB Storage – RM 9,799
Microsoft Surface Pro 4 Type Cover – RM 529
Microsoft Surface Pen Dark Blue – RM 240

No longer worth buying due to the weak currency. I shall keep my SP3.

Wait, the price includes the pen right?

will this price drop once it's landed here?

Thanks for the tip.
Yeah, did try that but unlike a regular laptop, I can't seem to get an option to "forget" the address. Right clicking does not work. Would you happen to know how to "forget" the connection?

Will inform you all while stock available.

Arrival at US address for the Surface Book tracked to October 26th instead of starting shipping only on 26th. Which means it may gets here on 30th or November1st. One week early!

looking for sp4 i5, 256gb. sold out at lazada. anywhere else?

Specs and benchmarks are in the review: http://www.mobiletechreview.com/notebooks/Vaio-Z-Canvas.htm and you can compare with SBook and SP4

guy how sf3 vs sf4 ?
i own SF3 pro but hardly use (own 1 year use time less than 5 hour) as i use switch 12 more ....

so worth to upgrade ?