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Depends on your definition of fun I guess and what your local meta looks like. If I could just pluck models off the shelf, I always thought it'd be amusing to run a Centurion Siegebreaker Cohort together with a Landraider Spearhead, but I'm not going to go out and buy that army just for the lulz. Worst comes to worst, assault cents aren't thaaaaaaat bad in a casual meta and Ironclads have been the only usable dreads for ages and only got better with the buffs a few months back while grav cents can easily make up for any shortcomings of the rest of your army.
As for pros and cons, I think you'll have a lot of one sides games, where the enemy either easily deals with you or gets bent over hard and they're not usually fun. You're relatively immune to a large amount of small arms fire but you've also got no invulnerable save and anything that even remotely looks like a squadron of vindicators is going to cause you to have a Very Bad Day tm.
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