I don't agree that wheeled cases are necessarily better. Mostly, the wheels are VERY small diameter, getting caught on most things, rolling over many obstacles with difficulty. The larger the wheel, the bigger the obstacle it glides over.

I prefer one of these: http://tinyurl.com/238l6wy and a case that is actually DESIGNED for the keyboard, rather than shoehorning into an oversized case (because most 61 cases do not work).

Sure, it's a bit more expensive, and it's a bit heavier. But, after ten years (or even five!) of dragging an arranger round to multiple gigs a day, the extra money I can sell my used keyboard for pays for the additional cost of a custom case.

If you ever find yourself in a situation where someone ELSE might move your gear, having something strong enough to survive their uncaring will pay in spades! And accidents happen to the most careful of movers. A speaker slips out of your hand and drops on top of your arranger in its' case. Still happy you got a soft case?

A heavy arranger in a heavy case is a PITA. A broken arranger in a soft case is also a PITA. Which PITA can you live with?