I used Sevylors for quite a few years, then a Flytepacker and borrowed a Klymit. Trouble with light rafts is controlling them why you try to cast. If you're trolling, fine. As a fly fisherman, I find them not worth the effort, as I spend more time trying to straighten them out. They also will pull towards even small fish, taking all the fun of the fight out. I've used a mesh anchor and a drag sock, which helped but miles and miles behind the effectiveness of using a float tube with fins. Rather than spend the money on a UL float tube, I cut the front floor out of my Flytepacker and reinforced the edges and corners. It now is controlled by my Force fins and works very well to fish from. A number of lightweight float tubes exist, along with some light options in packable waders and fins.
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Charlie