Both the Spider IV and the G-DEC amps have the new technology of storing data, songs, and certasin effect types, but I can't decide which one is better and its really starting to get to me, the Fender G-DEC is smaller overall, but seems to have a better computing power, and the Spider IV seems to beat the G-DEC out in effects and user-friendliness.Which one is better

A fan here, of the L6 Spider Jam 1-12". 13 months ago bought a G-Dec 30 and played it overnight...something was missing.

Traded for the L6 the next day. No remorse.'Dunno if the new Spider IV is even better, but if it is, it sounds like a winner. And L6 amps sound great with Fender guitars.

Don't know about the Line 6 but I just took home a G-DEC 30 Blues and I'm havin' a ball with it.

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Donnmac

'09 American Deluxe Strat Sunburst Rosewood
'63 Les Paul Jr SG body
'80's Fender F 15 Acoustic
'09 Larrivee D 03RE
'09 Squier Affinity J Bass
'10 Martin D12X1AE
'66 Traynor YGM1 (tube)
'08 Traynor TRM30
'11 G-DEC 30 Blues
'09 Fender Rumble 15

I really regret not getting a Spider Jam over my GDec 30. I have the first generation. From what I've read, there's been some weird software problems as well as firmware update problems. I don't really know for sure, but I'll tell you what, Fender really sucks at the effects end. They never really did effects all that well. Line 6 specializes in them.

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Life...... It's sexually transmitted and always fatal

I've only used a GDec 3-15 and have recently upgraded to the GDec3-30. They are very good amps, especially the 30 with the line out feature. I find the effects to be quite good and the Fuse software works quite well, although there's a bit of a learning curve initially. You can download other content for the amp from the Fender site and make it into whatever you want.
I highly recommend the GDec3-30

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......it's a topsy-turvy world when noses run and feet smell...