Can't say anything about the Spiderflex, but the Spongy Wonder is the best bicycle seat I have ever owned.

Nerve damage and poorly-healing nerves run rampant in my family...3 close relatives of mine have neuropathy, one of whom never even had an injury in the damaged area. I myself suffered extensive pudendal neuropathy and near complete numbness for about two years after cycling with a conventional saddle.

The spongy wonder helped me recover; there's no question in my mind about it. I could pretty much see myself cycling with only this seat and no other...nothing else I've tried comes close.

Maybe the Spiderflex is good; I've never tried one or even seen one, but if you get the Spongy Wonder, if you're anything like me you won't regret it.

The Spongy Wonder is kind of expensive for what it is, but I mean, with care they'll last your entire life, so I think of it as "buy once, cry once".