as an owner of the 4/5, i just cannot state how good they are! yes, may be low efficiency....for some....may be limited bass output for others, (btw what bass output does the world famous ESL 63 HAVE?) but as far as musical engagement goes, mid band transparency, and all the makes music at home so engaging and enjoyable, i don't think there is another speaker that one would find at this price that comes even close.....and before i leave let me say that i drive mine with an old REVOX 40 tube amp, just delivering a beautiful 10 watts a side, and i never found it not giving me good enough volume, not that i want deafening levels. and as far as price goes, let us remember that this REVOX 40 sold for a hefty 590 swiss francs, in its year of launch, 1963, and a good one even today command anything from 1500 to 2000 dollars. one has to account for the price of producing quality within the uk, and spendor makes its own drivers and cabinets, (except tweeters i think). and for those who just want to consider price as the main buying factor, there are bookshelves available right from 250 pounds....dont ask where or how they are made!! cheers and enjoy your music!