I've been using msm for about 3 years. I've been really pleased with the results. I've used it as a stand alone product as well as a companion with other products. I usually mix with a low rate of 3 way. Although I am trying it as stand alone broadleaf control on a 35 acre property this year and so far am very pleased.

1.As a stand alone, it is extremely slow especially in cold or dry weather.

2. It needs to be premixed in an old jug or bucket. It will not dissolve on its own with normal agitation.

3. It needs a good surfactant. I like mso if conditions are mild. 90-10 if it is hot.

4. I wouldn't expect much against crabgrass. It takes a high rate to possibly control crabgrass. You will not like the results to the turf.
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Msm is a good stand alone for broadleaf weeds if the customer doesn't mind waiting 3-4 weeks for results. I mix it with octane for a faster knockdown. Crabgrass control? Ummm no. We use Celsius or blindside for Crab in St Augustine and quinclorac for crab in zoysia or Bermuda. Not sure why they're telling you it's great on crabgrass.
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Crabgrass control? Ummm no. We use Celsius or blindside for Crab in St Augustine and quinclorac for crab in zoysia or Bermuda. Not sure why they're telling you it's great on crabgrass.
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I'm guessing some of these guys confuse MSM and MSMA

 

Crab is on the label but at higher rates, better consider the turf at those rates. Prob better products for crab but can have some effect

 

Also keep in mind msm will damage trees if sprayed on the base or around the root system