08-05-14: TbgTbg, I think what your'e referring to is the fact that up to recently, Ultra 5 feet were only threaded on the bottom to enable the feet to be screwed into components and speakers (as per the Vitus MP-S201), however Stillpoints recently started spec'ing Ultra 5's with threading on the top *and* bottom to enable the feet to be installed in the optimal sloped side up configuration. Now when I say "optimal" that is my subjective opinion, although I note my viewpoint accords with Christiaan Punter who authored the following review for hifi-advice.com - http://hifi-advice.com/Stillpoints-review-2.html
Melbguy1, with the Ultra bases you will not be using the Ultra 5s in the recommended way. I have no idea what threaded options there are under the Magico S5s but if you could use them to mount the Ultra 5s so that there is some minimal distance between the bottom of the speaker and the bottom of the Ultra 5s, you could adjust the angle of the speaker, mount them properly, make the speakers more secure, and save the money for the bases.
I have a pair of LSA1 monitors with no threaded holes on their bottom for which I have to use the Ultra SS wrong and dearly wish I could use them the other way.
In regard to using the thread adaptors attached to the speaker for height adjustment (in lieu of using the Ultra Bases), I don't think that would work as, atleast the thread adaptors I have for my S5's are too short on the speaker end to allow any useful height adjustment, and to do so might compromise the structural integrity of the adaptor. Imho you don't want to push it as for example my S5's are 86kg which is a lot of weight baring down on the adaptor & I know of one other S5 owner who, using the older narrower adaptors, bent an adaptor 'walking' his speakers into place. My newly spec'ed adaptors however have a much larger diameter for the most part which will give the adapter greater strength.
Btw, the Ultra bases further improve the sound of the Ultra 5's by allowing the 'technology pocket' to be better isolated, and therefore work more efficiently. I tried the Ultra 5's with Ultra bases under my Vitus SIA-025 and found one foot was not fully in contact with the component with all 4 bases broken a 1/4 of a turn as recommended. A quick adjustment of the Ultra base & problem solved! The easy height adjustment is another positive about that product. Given they are only about $69 each, to me if you're going to invest almost $700 on an Ultra 5, they are a no-brainer.