Well, going from a thinkpad x220 -> mbp is a big change. But I found that the dell xps 13" was very easy to migrate to, and wasn't agonizingly slow for compilation like the older thinkpads.

I still like my x201 and x220's, but I relegate those to less intensive tasks. I have openbsd on one that I pretty much just use for writing articles or emails, which is nice.

However for travel, the older thinkpads are just so incredibly bulky compared to the xps models or the new framework laptop.