So on that laptop I recently bought....
It still carries the name "Inspiron" and my work laptop is labeled "Latitude," so that's how I'll refer to them even if the names are about to be defunct (Dell and Dell Pro, according to utee).
It's a Inspiron 5000 series (don't remember the exact number), so that'd currently be a "Dell Plus." The work machine is a Latitude 9000 series so that'd be a Dell Pro Premium. I didn't purchase the work laptop of course, so I'm not sure how much it cost, but the new personal one was on sale for $600. I think it was $150 or $200 off, so hypothetically let's call it a $750 machine.
Won't know about longevity for a while, but as for performance, I have to say I'm very happy with it. I can't really discern a difference between it and the work laptop (no idea if the i7 processor in the personal vs. i5 in the work one mitigates any other specs). There are a couple of cosmetic differences in which the Inspiron is inferior, but I'm not sure I'd be willing to pay significantly more to upgrade them. i.e., the work laptop's screen has richer, more saturated colors when I compare the same pictures, and it's most noticeable with black, where the work laptop looks like a very deep, dark black (I like that) vs. the Inspiron which has a lighter, bit more washed out black. And at least some purples....I pulled up photos of LSU players and the Latitude shows the purple jerseys true to life, whereas the Inspiron pictures turns them basically to blue....not true to life at all. And the Inspiron's touchpad feels really nice, but when you press it to click (as opposed to lightly tapping to click), it feels a bit cheaper somehow than the sleek feel of the Latitude's touchpad when depressed. And I prefer the hinge design of the Latitude to the Inspiron. But that's about it, and honestly the screen looks really good on mine.....I only notice its inferiority when I directly compare it side by side to the nicer work machine, or the wife's Macbook.
I was never really sure exactly what the difference between Latitudes and Inspirons were supposed to be. I know Latitudes were considered "work" machines, thus the new label "Dell Pro" I suppose. But I'm not sure what tangibly separates them. Maybe it's just the cosmetic things. Or maybe these cosmetic things I mentioned are incidental to the two machines I happen to be on frequently. It does seem that Inspirons and Latitudes in the same spec ranges have comparable prices, so again I don't know what's the difference, other than maybe in the future I'll be inclined to go with Latitudes, or Dell Pros or whatever. But assuming I get several years out of this Inspiron, I'm happy with it. I've loaded it up with all my data analytics software and it runs my ML notebooks fine. And the main thing of course, which is the browser goes to cfb51.com and YouTube just fine.
Now I just gotta figure out how to get Microsoft/Windows to quit bugging me about the cloud. Once the old laptop (a Latitude) is ready for full decommission, it will become my latest Linux machine.