I was doubting the same thing. I ruled out the Spectre because of the bad speakers. I really like to listen on my speakers. Not to mention, HP charges more for their accidental insurance. Then I considered the Inspiron 2-in-1 Special Edition, and I actually made a thread about it. The problem with it vs my Surface Pro 4, which I was trying to decide if I wanted a Dell, HP or Surface, was that those are PRIMARILY LAPTOPS, not TABLETS. I really love the portability of my Surface Pro 4. It works SO well as a tablet, so light, I can throw it in my bag and take it almost anywhere. A laptop option weighs more, is less comfortable in tablet mode and is much thicker. So I am deciding to stay with my Surface Pro 4.
But given the choice between the spectre and the dell... If money were no option, I'd probably go with the Spectre. But bang for the buck, I'd go with the Dell as it's 999 for the i7/8gb ram/256 SSD, and it's a very capable machine that should last years to come (as is the spectre). The problem with the dell is that... It's a little thicker and heavier than the Spectre. Here's a MobileTechReview that'll more or less show you the differences between them.
https://www.youtube.com/watch?v=XyA0RsDHnI0
Enjoy!