I owned the MX150 model, so I feel like I can best offer some insight. For starters, I returned it for the $1499 base ice lake model, and here's why;
1. The color. Unlike black, The mercury white looks classy and reminds me of an older Apple powerbook, not to mention it doesnt attract fingerprints and oils like the black one does.
2. The MX150 honestly is a terrible GPU. Though it's better than nothing, it didn't have much to offer in terms of performance and really just ended up a battery hog. The new base model Stealth's Iris graphics are much better than UHD, and I'm happy to have it in this form factor because it's more balanced and offers much better battery life.
3. LPDDR4X and 802.11AX on the base mercury model, vs 802.11AC and LPDDR3
4. Mercury model sports a 25W i7 vs the 15W i7 in all of the MX150/1650 models.
Yes, it's expensive, but the competition for the same specs and build quality isn't any better.