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If your thinking about buying one just do it. I like the flashers as opposed to the lcd (liquid crystal display) units for two reasons. Flashers are immediate response, no delay like you would have with an lcd. Doesn't seem like it would make a real difference but I think the difference is huge. I think and i bet most people would agree that the best reason to have a finder is to read the mood of the fish. If the response of the unit is delayed at all you loose that. The second reason I would go with the flasher is I have seen some of my buddies lcd units not work when its cold. Thats a pretty big deal ice fishing. As for different types of vexis, I would go with the genz, I think its about 250 and the one I saw was super clear when I used it. I have an fl-8 or fl-18 I forget but it doesn't have the bottom lock. I have used the bottom lock ones and really I think its a 1 or $200 luxury, hardly a neccessity. About two trips out and you will know all you need to know about seeing fish on the bottom. Hands down though if you thinking of getting one just do it. Your fish totals will increase ten fold easy. I feel naked out there without my vex now. You can see fish and drop your bait right on them or raise it up if you need too. Its an absolute necessity for kokanee I think because day to day they can be anywhere in the water column. The vexi tells you where the fish are. It tells you to stay or move, jig or sit still, keep fishing or just go home. Just get one.