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Does anybody use them and if so how do you find them?

I think they can be fun, and the way I generally use them with with graviton guns, and I run them as if they were defensive assault marines: A close combat unit that is meant to take charges instead of giving them (since they have defensive grenades)

Basically the same as above, though if your Ultramarines you can go full Roman style and take power swords instead of boltguns for 5pts, which is quite fun as a tarpit to run alongside Invictarius Suzerians.
They're a good unit to hold objectives too

Ultramarines is the legion I play so happy days

Sound, then stick them in a land raider in support of a Suzerian squad and let the fun begin!