Commodore 64 and BBC - damn difficult, a few pixels out and you were toast
Amstrad CPC (what I had) - a little more forgiving, but your first purchase was still always a docking computer
Spectrum - throw it in sideways, it'll be fine!

Slightly off topic of the thread, but I remember when getting in early meant you got a cheap price for, a) helping the developers and b) getting to help test a buggy, half finished mess. I got Mount & Blade (the original) for about £5 when it was being developed, and the cost slowly went up to full price the later in the process that you bought it.
Since when did paying 5 times the price to help test a buggy, half finished mess become the norm?! It's taking the impatience of gamers to a whole new level.. and then cashing in on it, big style.