anybody ? can anyone who has linds exxxtras give their opinion on them ?

I had both and now wear Dexter because the hockey puck thingies didn't seem to give me as true of a slide as the whole sole does with Dexter.  The shoe bottoms of Dexter are wider and I think there is a difference in stability at the line as well.

Several pro shops in my area sell spare parts (soles/heels) right off the rack so replacements are easy to come by.
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White Dot
Where am I going and why am I in this basket?
"I wish I was in Tijuana...eating barbequed iguana..."
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I use the Exxxtras, never had Dexters, and I like the Exxxtras.  I found a source that had some teflon pucks and for synthetic lanes I use two teflons.  If I need less, I just put a slide sock over the shoe and I am good to go.  I bought my Exxxtras when they first came out and they still are in very good shape.  

I've heard several bowlers who like Dynaroos, you might want to also check those out.

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I am the SGT Schultz of bowling.
"I know nothing! I see nothing! NOTHING!"
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I just want 2C was'zzub.