Sort of… I borrowed a Swiss Multifix from a friend (he was going on holiday and didn't need it for a couple of weeks!) to try it out on my Connoisseur, then subsequently bought a clone from Rotagrip. Size A.
If you intend to sit it atop a Myford top slide, I think you would be wasting your money, as you wouldn't gain many of the advantages it has over a Dickson. Also, you're supposed to fit dowel pins through the Multifix into whatever it sits on, to accurately position it and prevent it from twisting on its securing bolt – I think that might be inadvisable with a Myford top slide, it's weak enough as it is, without drilling more holes in it.
The A size is too big for the topslide, it's not possible get even an 8mm tool low enough to get it to centre height, you would have to order the Aa size, of which I have no experience.
However… if you have a DRO fitted and don't need the topslide for most work, then a size A Multifix can be mounted directly to the cross slide via an adaptor plate – I'd say go for it, it is better than the Dickson. And as it happens, I've designed an adaptor plate, the cast iron for which is currently on the milling machine being carved to shape! It should be finished next week.
Disadvantages of the Multifix over the Dickson: 1) the cost of the tool holders – they're something like twice the price, 2) for the size A the 1675 holders are 25mm longer, so you loose 12.5 mm of space between the front and rear tool posts, and 3) for 10mm tool overhang tools must be at least 50mm long as the holders only have 3 bolts spread over their 75mm width, preferably 85mm to get a tool clamped by all three bolts.