The GOUT would be the only way for you to experience the pre-1997 versions.
For Star Wars:
In 1981, the words "Episode IV: A NEW HOPE" were added to the title crawl and the words were re-formatted (including the capitalization of "rebel").
In 1997, the "3D monsters on Tatooine" were added, as was the Jabba scene, the Han/Greedo scene was altered to make Greedo fire when he never should have, the end battle was "enhanced" with extra CG shots, a short scene (that was chopped up to fit with the Vader-as-Luke's-father idea) with Biggs was added on the Yavin IV base, and many other, smaller changes were made.
In 2004, additional changes were made, in addition to incredibly fucked-up colors and a horribly "remastered" sound mix that included swapping the left and right surround channels for the music, for no apparent reason. All in the name of "deliberate creative decisions."
The GOUT uses the 1993 laserdisc audio instead of the theatrical mono or stereo audio, but other than that every change listed above is not present in the GOUT.
For Empire:
In 1997, more footage with the Wampa was inserted, which arguably ruins the suspense of the scene. Cloud City had CG "enhancements" added, including the addition of windows throughout the city that sometimes mysteriously disappear when ILM forgot they added some. Darth Vader's trip to his Star Destroyer was spliced in after the duel as well, using outtakes from ROTJ, again arbuably ruining the flow of the scene (and changing Vader's "Bring my shuttle!" line to "Alert my Star Destroyer to prepare for my arrival").
In 2004, Ian McDiarmid, while shooting ROTS, re-shot the Emperor hologram scene (originally Clive Reville's voice and an old woman's mouth with monkey eyes) in his horrid ROTS makeup that doesn't look a thing like his ROTJ makeup. Lines were added to this scene as well that - arguably - ruin it. Also, Boba Fett's lines were (again, arguably) horribly re-dubbed by Temuera Morrison (clone troopers/Jango Fett in AOTC/ROTS).
The GOUT includes none of these changes, but again, includes the 1993 laserdisc audio.
For Jedi:
In 1997, the Jabba's palace musical number Lapti Nek was replaced with Jedi Rocks, which sounds (arguably) awful, and Sy Snootles (singer) was replaced with a CG model. Other new CG creatures have been added to the band as well. Then, the original actress for Oola (the green dancer) was brought in to shoot additional scenes of her actually in the Rancor pit (you still don't see the Rancor). The Sarlacc was "enhanced" with a CG beak-looking thing coming out of it and extra CG tentacles. In the end celebration, instead of the Ewoks singing Yub Nub, John Williams re-scored it with a new, (arguably) more appropriate, New Age-y song.
In 2004, Sebastian Shaw's head has been replaced with an outtake of Hayden Christensen from ROTS in the Force-ghost scene. In the Vader unmasking scene, Sebastian Shaw's eyebrows have been digitally removed (this change I actually agree with). I don't think there were any other major 04 changes for ROTJ ...
The GOUT includes none of these changes.
So, if the version you grew up with didn't have all this shit in it, then yes, that's what you want. If you grew up with the 1997 versions, you're shit out of luck, unfortunately, as there is no official release of the original Special Editions on DVD.
The new "Star Wars Original Trilogy" DVD box that contains all 3 movies in 2-disc versions in slim cases with a blue outer box includes both the 2004 SE DVDs and the GOUT.