My experience with Saurus Cav from the SCGT, for what it's worth (6 strong with Banner, no Spears):
Game 1: Shot off turn one by Wood Elves.
Game 2: Ran across the table to contest a table quarter, giving me a small loss.
Game 3: Failed a Stupidity test turn 1, got shot down to 3 by WLCs, fought a Doomwheel for two rounds doing... nothing. Dead by turn 3.
Game 4: Failed a Stupidity test turn 1, got charged by a Daemon Prince and Chariot. Dead by turn 2.
Game 5: Got charged by Morbidex Twiceborn on the first turn. Dead by my turn 1.
Game 6: Got wise and deployed them within 12" of the Slann. Passed Stupidity! ... Then got charged by a solo Scar-Vet cowboy, lost three, did no wounds back, failed their re-rollable LD9 break test, got run off the board. Dead by turn 2.
Note: 5 of my 6 games were using the Meeting Engagement deployment, hence the turn 1 charges.
Conclusion: Garbage. Utter, utter garbage. In all but one game they were a complete waste of 190 points. As noted previously, they are ideal in going in the flanks. In 4 out of the 6 games, I had them positioned right out on the flank so that they could present just such a challenge. I accepted that they would probably die, but they might YOLO to glory in the process. Nope. Turns out, being on the flank tends to mean being outside of the Leadership bubble.
The one time they did do something, in game 2, they never saw combat because my opponent (wisely) did not care less about them, and focused on destroying the things that actually mattered. In all other occasions, the most I can say about them is that they slightly distracted some of my opponents units for a turn or two, but even that's not saying much when they died so quickly and easily that those units were back in the game after a turn or two.
As I feared, despite their plethora of attacks, they just can't do anything with them. Maybe it would be different against more Elves, rather than the 3 Warriors players I faced, but I don't see why they'd survive 4x RBTs any better than a round of Wood Elf shooting.
The only reason I took them, and the only reason I'd consider taking them again, is that SCGT comp favours mobile Fortitude, and they've got M7 with a Banner. But I would not bother going higher than 5 and spending the points better elsewhere. Even then, I'd be strongly tempted to just take several units of Skink Cohorts instead, who are only a little slower at M6. Those same points could give me two units of 12 with Musicians and Standards.
My last round opponent was using them as a mini-bus for two mounted Saurus characters, which is about the only value I could see. That being said, I Bastiladon'd them round 1 down to 3 models and they spent the rest of the game hiding, so...
assuming nobody die before they strike 
