Having worked on machines from pretty much all the vendors, I don't like the way Dell's are designed.
And no, I'm not taking about aesthetics.
I'm talking about crucial things like:
Desktops: Non industry standard cases and power supplies.
Laptops: hard drive connectors that sit on mini daughter boards bolted (I kid u not) to the motherboard. One drop and the connector shears off.
Poorly designed motherboards that need 5 or more ribbon connectors for peripherals whilst most others get by with one. And don't get me started on buggy firmware that doesn't handle sleep transitions properly resulting in data loss / corruption.
You couldn't pay me to buy a Dell.