I have a Cls35. It has a colour head which I presume is the only difference, but I'm no expert.(posted 8905 days ago)From some old magazines I have, it appears to date from at least the mid 1970's. Mine is a 35mm enlarger but a 6x6 conversion kit was available. I'd say it is obsolete, but by no means useless.
Generally I'm happy with mine, it appears to be well constructed of qaulity materials, but these are my gripes: If you do not intend to mount the enlarger head seperately, the standard column is a bit short for my liking. Also, the negative, at least in my enlarger, does not sit firmly within the neg carrier; I don't know whether this is a design fault or whether I have a part missing - I bought mine second hand. Others may well comment further on this.
I suppose you have to also consider the price offered and your needs. Eg, if you do not expect to make prints larger than 8x10's, then the column height is not an issue.