I've had both ones that load from the top and load from the side, and I much prefer the ones which load from the side. My old top-loading one had velcro, which was impossible to keep open for the entire length of the bag.
I have the standard laser bag & it works well, I also brought a Rooster bag & was disappointed,
it has a lot less room for the tiller & extension to the point of both the tiller & extension will hardly go in there pocket together.
The blade part is very tight with no room at all, the zipper is bursting at the seams when trying to do up.
For any kind of covers, I would only go with Colie. The quality is so superior and it will last for decades. Even though the intensity one is nice (like all of their stuff), it doesn't fit the longest tiller extensions (48" +) in the pocket - it's just a little too short.
Have to cast my vote for the Intensity Sails bag as well. Quality and fit is superb, and excellent value for the money. And it definitely accommodates the longer tiller extensions, since I've got one myself. As noted above, it's adjustable for the longer sticks. Looks pretty darn cool, as well.