The wiring openings in the 1590 base don't look as sophisticated as the ones for the 1290. just the rectangle to get the wire through from the speaker and then a small channel to get the wire out from under the speaker. Looking at the 1590 bottom in the first post in the thread it does not appear that the opening is directly over the connection and would need to be set in place when the bases are installed. The 1290 base appears to allow more leeway in the wiring on the bottom of the speaker.
The other thing I noticed is I mentioned that the 1590 has a ½" bottom extension on the speaker but this base only has a 1/8" depression to fit the speaker into. This would leave a 3/8" reveal around the veneered section of the speaker. I believe this 1/8" depth on the base is to keep the strength of the MDF base which looks to be 1".
The 1590 isn't trying to tip over like I have heard the smaller speakers in the line might want to do more quickly. Sure with kids and animals it may be more important to have the bases on the 1590, but generally they would not be necessary.
Curious as to how these would be spiked? The base has holes to screw them to the speaker but the spikes is used in those holes would make the speaker look unusual as well as not provide the wider footprint of the base for support. The base does have what appear to be hard plastic feet so maybe this option was not designed for spikes. There are no marks on the speaker for the base to mount. If one were to have the best of both worlds, spikes or bases, it would be nice to use the same holes for both, but I guess for added support (anti-tipping) it would make sense to use some of the outrigger spikes that are available on the market. to get an idea of what I'm talking about, check out this sold listing on USaudiomart for the Von Schweikert VR-2 speakers, a column speaker with bases similar to these ADS and outrigger spike sets.
http://www.usaudiomart.com/details/649127089-von_schweikert_vr2_speakers_black_woutriggers/ This listing shows that adding what appear to be Soundocity outrigger spikes may cause issues if one is to use the bases with outriggers and maybe that should be left for the speaker alone, bases being used for different circumstances. Probably better for a hard floor and spikes for carpet.