Well in this month's Guitarist magazine they gave the Ibanez TS-808 Tube Screamer 4 1/2 out of 5 stars and gave it their Guitarist Choice award. So I guess they think it's pretty good.
Is it different from other Ibanez Tube Screamer models?
Yes, except the original.
Does it sound different?
Yes.
A lot different?
That depends on exactly which Tube Screamer pedal you own.
Is it worth $130 more?
If you like the sound of yours then probably not to you.
It really depends what amp you've got. The Tube Screamer is designed to push a valve amp into distortion whilst retaining the tone. If you've got a 1970's Marshall stack it'll work its magic and give you a classic 1980s rock tone a la Randy Rhoads. If you've got a solid state amp then a Tube Screamer is probably not a great pedal to use, unless you like the sound of it driving your transistors nice and hard.
Personally I chose to buy
a Voodoo Lab Sparkle Drive. This sounds very similar to a TS-808, but has the added benefit of being able to add some clean signal back into the sound. I use it with a Carvin Bel Air which has been revalved with JJ valves. It sounds awesome.
Another great overdrive pedal is the Crowther Hot Cake. Just check out the opinions on Harmony Central
http://www.harmony-central.com/Effects/Data/Crowther_Audio/Hotcake-01.html Neil Finn's been using one since about 1981 and most of the New Zealand bands I've heard of use them. They are made in New Zealand, by the way.
Pete.