Leather,
I have owned a number of knives of the variety you describe, including the United Cutlery Rambo knife. I regret to say that while they may look impressive, they're not the knife I would want in a survival situation and I will tell you briefly why.
In the first place, as many on this board have already mentioned, the hollow handle prevents the blade from possessing a sufficient tang. Instead the blade is attached to the handle with a mechanical fastener. While this method in no way interferes with the cutting ability of the blade, it does have an impact on other uses ~ both real and anticipated. For example, a blade attached by a mechanical fastener will not withstand the same level of force applied to the blade (especially towards the tip) that a full-tang model would allow, thus limiting the uses to which it could be put. Also, the blades are generally not made from high quality steel as they are manufactured primarily for appearance. The serrations on the spine of the knife seem useful, but I can assure you that they are not as I have tested them myself. They are generally too thick to cut effectively, and even then they rip rather than cut (and not in a very consistent manner, either) through the vegetation. In the time it takes to cut even a small vine, I could have hacked my way five feet or more with my machete or sliced twenty strands with my Cold Steel Trailmaster Bowie. The matches, fish hooks and other supplies could come in handy, but more often than not I am carrying these items into the field anyway and in an easier container.
I still own two knives of this variety though; a Maxam Survival Knife and an unknown model which appears to be a Maxam knife that was snitched from the production line. (It is absolutely identical apart from company markings and final finish ~ there are lathe marks still visible on the handle) Of the two my favorite is the unknown clone and I use this knife primarily for camping, though on occasion it'll pull double duty as my truck knife. It serves well for ordinary everyday purposes such as cutting rope, dressing fish, cooking, opening cartons, scraping salty snow off the wheel rims, and so on but I wouldn't rely on it for heavier applications.
In conclusion I would say that if you're looking for an attractive knife to perform basic chores (i.e. cutting and slicing) then it'll suit you just fine. But if you're planning on going into the wilderness where your life depends on it, take something else.
Hope this helps.