I was considering the Dell XPS 13 for a long while before deciding on the rMB last week. From what I could from longer term comments (by doing a google search mostly on reddit and dell's forums, e.g. "site:reddit.com" and setting "last month" for the search range) there were a few concerns I eventually had:
- Report of the SSDs subject to the same TLC read issues (slowing down for data not written in a couple months) that Samsung 840 EVO SSD had. This sounded limited to just some units (sounded like different SSD suppliers, but not 100%, I only found one or two references to this).
- Long-term touchpad issues, losing precision overtime, some firmware fixes to improve but didn't sound 100% fixed. This sounded like the biggest complaint right now. Maybe it just needs a good cleaning once in a while.
- Varying reports of screen brightness (some sources claimed 400 nits, others only measured 250 nits). Hopefully the large variation is due to the adaptive brightness control and not manufacturing QC issues.
- Keyboard debounce (rrrreaaappppttttinnngg keys a lot) briefly popped up and was subsequently fixed by a firmware release.
- Battery only rated to 300 cycles of recharge, not 1000 that Apple standardizes across their line.
- No TPM in the consumer models, only those sold to business? Making hard drive encryption a bit less convenient. This sounded like an export-restriction issue, not all that specific to Dells.
- Power cord "turning gray" and disintegrating after a couple months.
I'd take a lot of the above with a grain of salt though, since it was just limited user comment and not very well substantiated. It may be worthwhile looking into some of those with more depth. On the plus side, bezel looks great, very lightweight for the screen size, processor, and battery life (especially FHD model). If I were to buy a PC ultraportable it'd be the one, despite the concerns.