G'day Dobbo,
Answer is coz they're a better setup in the long run.
My red & yellow pair are about 5 years old. Still going strong. Previous pair had 6 years on them, no problems, I only changed them for a Simpson trip just in case.
1. Your ordinary D70s don't like camping.
2. The Spiral Gel doesn't need the periodic maintenance
3. Spiral Gel won't fail on endless corrugations.
4. Your D70 doesn't like being tipped on its side, or inverted. And admit it I have seen the Turdis at some very strange angles.
For me, its reliable, fit & forget power for starting, winching & camping. You can muck about under the seat while I have one of these.
Unfortunately there do seem to be some stories about re short life with Optimas, so maybe the quality is dropping off. Time to look into alternate brand spiral gels perhaps.
Regards
Max P
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