Andrew these are known to be the cream of biscuit jointers.They are the forerunner to all biscuit jointers and are certainly considered to be worth the money.They are without doubt a quality tool.
Lamello(Swiss gent) was responsible for the initial design of the biscuit jointer hence the name.
Lamello have been around for quite a while now and to spend the money on them needs to taken into consideration whether the work that you do will justify the outlay or whether a Domino jointer will also suffice.
For what its worth the Lamello have also been up front with R&D in producing knock down hinges etc to compliment the tool use.
If you want a biscuit jointer there are of course a lot of cheaper options and Makita make a good model at around half the cost.
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