It is big, but it's not too big. I figured if I went with the Loadwarrior, I would definitely have to get the extension at some point. The price of the Loadwarrior + Extension is more than the MegaWarrior. Now, I really don't have to get the extension. I've figured out the dimensions and I will doubtfully ever need the extension.
I got the Yakima Railgrab kit. It was $180 and included 2 pairs of the railgrab mounts and the 58" load bars, so it's a lot cheaper than buying them separately. Alone, the bars make a lot of road noise. With the basket, it makes little, if any, noise.
I used to have a Jeep Liberty. It had more cargo space, but with the amount of camping I do, I wish I had bought the basket earlier. I have two dogs, a St Bernard and a 40 lb mutt (both rescues!!), so I always felt bad driving almost 4 hours to camp and making them share the back seat. Now, if I do it right, I can put my junk on the roof, and one can get the back seat and the other can get the trunk area.
The width of the MegaWarrior is the most important aspect to me. Gone are the days where I cram all my junk in the front seat, get near the campgrounds, and make my girlfriend sit with all the firewood in the passenger footwell. I should also not have a gross leaky cooler in my car, leading to a soaked floor mat.
Roof rack, with the amount of camping and hiking I do, is an awesome choice. My only issue is that Yakima nickel and dimes you for everything, eeeeeeverything. $180 for the railgrab kit, $350 for the basket, $55 to lock and secure the crossbars, $60 to lock and secure the basket, $50 for the cargo net for the basket. After spending $530 just to get the basket and the crossbars, should you have to pay another $115 just so it cant get stolen? And should you have to pay $50 just so your crap doesn't end up all over the highway? All in all, almost $700 for a well functioning roof rack!