I agree with admin.  I wouln't run one if you gave it to me 'cause It's a pain to find software for them.  As far as there speed vee_ess on some application I believe a 300 Mhz can compare to a 1 G pentium.  I can't remember the cross overs but there running RISC instruction set that can be much more effective than the CISC of pentiums and Athlons.  Espically if the code is tweked to preform the best it can.  They have so few diffrent proccessors and configurtions that the code can really be tweked for a specific set hardware without shutting out many customers.  Programmers for PC's have to write it be very tolerant of many diffrent standards and hardware specs so it's not as optimised.  But if you can't find the software you want what's the point.  PC's will stay ahead for of MAC's for a long time.