My decisions to buy X390 were;

1. Price. Didn't want to spend too much, since this is a personal machine not used for work.

2. Screen resolution vs size - for me 13" is maximum I'll go for FHD/1080p. If bigger 14" screen like X1C, I would need the 1440p screen upgrade, which increases the price further.

3. Read a lot of QC issues with 6th and 7th Gen X1C units

4. DDR4@X390 vs DDR3@X1C

5. I'm a Linux user, so AMD options like X395 were not an option due to AMD's poor history of power management and lack of LVFS support (to upgrade BIOS and EC firmware) on Linux.

6. Warranty add-ons; Compared to other models like X1C 7th or T490s, the X390 had the best warranty add-on offers at the time I ordered - 3yr premier + 3yr Sealed Battery Warranty + 3yr Accidental Damage all for RM1 each.

My X390 arrived a few days ago, but haven't had time to sit down and give it a proper go yet. At the moment, based on hardware alone, so far I have one complaint - USB Type A ports are damn tight. Really need to push my thumbdrive really hard to get it in. Will post a short review in a couple of weeks, but my usage will be based on Linux only, so maybe won't apply to you.