Switching to google Fi as a heavy apple product user?

I found that project fi is way better for me and my uses and the fact it will save me lots of money.
But…
There's a catch, I have quiet a bit of apple products. I have an iphone 6s, 42mm apple watch, and 2 apple tvs. All of them are kinda codependent so it will be kinda lots of that money wasted. Mostly the iphone and apple watch will go to waste. I bought the apple watch a few months ago and the iPhone last year. I don't know if it will be worth switching concindering how heavily invested I'm in apple and the fact I will need a $500 nexus phone and I will probably end up spending $300 or more buying myself a smart watch cause I like it. Currently I'm spending $130 a month on tmobile one with one other person but I usually don't spend that much data outside of home so it will be arround $55 a month for me. Tell me is ot worth it or not

Project Fi has the biggest advantage for low data users who travel especially internationally.
Less dead spots when phone switches signal between three service providers and calls out side us are usually less then most companies with a plan tailored to traveling to that country.
If they still have the LG Nexus 5x, it is under $300 and you can see if you like the service. Last I checked they had 32gb in white.
You can use your iPhone as an iPod Touch, I use my wife's old iPhone 5 to listen to Audible books in my car.
I have three out of five phones on Fi currently because on son did not want a phone the battery couldn't be taken out and my wife is very happy to have downgraded. To iPhone but will bring the Fi phone I replace our landline with if she visits family in UK or PI.
I still have their smartphones on Cricket, if spending less is your goal you might try Cricket if AT&T has good signal in your area. For that matter t-mobile might have a better plan for a low data user.

One of the Project Fi user groups might be a good place to ask this question, likely an iPhone user will give a good answer.
I say if will to risk the the money, try it without porting your number then you can leave T-mobile if you like it more and are content using an Android phone.