My experience with Kenwood's poweramps is limited to the M2A,the M2,the L-1000M and the L-06M monoblocks.
I like the M2(a lot),but have only heard it in my system from 800Hz and below(used as Bass amp in an active speaker system).
The L-1000M(I have 2 of them),I have used as Bass and Treble amps(ie 2 of them used together)in my active speaker system.They are really nice amps.Very involving sound,loads of subtle nuances coming through.Classy,classy sound.Good Luck finding one though.They show-up(anywhere in the world)very infrequently.Don't expect to see one at your local Goodwill(or it's equivalent) for $10.
The L-06M monoblocks were one of only three Sigma Drive amps to which Kenwood applied the coveted 'L' Series nomenclature(the others being the L-02A,and the L-08M monoblocks).The L-06Ms are my favourite poweramps(that I have used in my system).Like all poweramps,they can't make a flawed signal any better than it already is(think pig's ears and silk purses),but given a really well-sorted signal they will amaze with all the things that Solid State is not supposed to do well.I feel that they
must be used in their Sigma Drive mode,otherwise the magic that these amps have is lost.I'm still amazed at how good these amps sound.
The Kenwood Basic M2 gets my vote for the bargain,although the more I talk-up these amps the more the price will rise(should I shut-up about them?).
The L-06Ms are also cheap,
however I've never seen a pair for sale outside of Japan.Thus the freight costs and any import taxes/duties have to be added to the cost.EW has pointed-out that getting someone to service them may be a complication also.