As SmokinJoe pointed out, and has been discussed in other threads on this board, the necessity of using shockmounts if you fly your mics on a stand is questionable. From anecdotal evidence it would appear that all but the most serious of knocks and bumps are attenuated by the stand itself and will show up only slightly, if at all, in one's recording. As he suggested, experimenting with the plain plastic mic clips before dropping money on shockmounts could be worth trying.
Conversely, if you clamp your mics to railings, soundboard cages, drink shelves, etc, and don't use a good set of isolating shockmounts you can be pretty screwed. Especially if you have some ADHD case beating away on whatever you're clamped to like it's a drum head. Your pull will sound like you recorded the show during an earthquake.
As DigiGal noted, the mounts that the OP is looking at are each within $10-$15 of the Rycote InVisions. If the OP is already planning to spend $100 or so on the mounts, are the Rycotes worth the additional $25? In my opinion and from my experience, I believe they are.