[LAU] About some plug-in quality

I've been using lots of LADSPA plug-ins with many GNU/Linux applications. (by the way it's been sometime that i gave up using any windows applications in my home studio) When it was with windows i tried too many high quality VST plug-ins like URS, McDSP and etc. These plug-ins engaged that they simulated some analog systems like SSL, Neve and others. I wonder, 1) Is that really true ? Can they really do it ? if they can how far can they ? 2) They are really expensive software. Is that because they are paying to the consumers of the analog products for the algorithms of their system's simulation ? 3) What about the LADSPA plug-ins like CAPS, TAPS ? They really work great i guess. At least they satisfy my needs. Especially with TAPS reverb i liked it very much. Thanks. -- Arda EDEN Cumhuriyet University Faculty of Fine Arts Department of Music Technology