I recently got an X3 (on a sale £58 with shipping) after deciding between X4 and X3 for a long time and I think I made the right decision. I fits perfectly in my wallet and I don't think about it.

Carrying my regular 6" ereader around feels like I'm taking something with me, it feels like extra weight. I have to either carry it in my hand which is inconvenient or take a rucksack with me when I go for a walk. X3 is so small that it doesn't feel like I'm carrying anything, but it's always there. So when I go for a long walk and decide to take a short break I take it out and read for 10-20min. Same on my commute, I replaced reading the news on my phone with reading for 25-30min on the train.

First think I did was flash Crosspoint on it, because it's lightweight and preserves the battery much like original OS. Battery feels great, I love that it's not touchscreen. Buttons take getting used to, but overall I'm impressed!