People say its a stronger version of shrooms, much stronger.... but with a little different effects...
Like shroom trips are apparently more spontenious... ive never tried acid tho, so i dont know for sure...
And no, salvia is nothing like LSD... unlike salvia, lsd causes extreme euphoria..(overwhelming feeling of happiness) ive done salvia, and i know it feels pretty uncomfortable.. and the hallucinations lsd brings are not as strong as salvias...(much more colourful, and detailed though)

If you've tried mushrooms... your pretty much in for some of the same tripping effects... such as seeing colorful patterns, and designs, random objects melting, and morphing together while eyes closed, vision is swimming(objects melting, moving, swirling, distorting)
Its awesome... try shrooms if you didnt like salvia... i did salvia before i tried shrooms, and i loved my first shroom trip... it was mindblowing.