I use both kaeso and eve taylor....but will be switching to just eve taylor.
Kaeso products are lovely, smell fab and are paraban free. The the down side is that their range is quite limited ( cleanse, exfolitate, mask, tone moisturise ) there are a few extra's like make-up remover, eye gels and mud mask, but I think that is about it.
I think it's a good range for basic and prescription facials, but as Kaeso are all over the internet ( amazon /ebay ) for pretty much the same price therapists pay, bar the postage, there is little chance of meaningful retail ( with the exception of the basic skincare kits they do ). I don't think there is therapist support as such, as it is a wholesale brand.
Eve taylor have lovely products with a nice range ( day creams, night creams, anti-wrinkle, listing masks, serums etc) so you get a much bigger range of treatment options you can offer. I find it much more suited to the facials I do as I concentrate on specialist facial treatments.
There is a lot of product support, ability to train at eve taylor HQ as well as customer leaflets etc.
It is all boils down to who you are and what your treatments are going to be.
If you are a salon who does a lot of facials and will do a lot of retail there are many more options out there, but for me as a small home salon I find Eve taylor very good.