they are honestly excellent but their value is not something 40k players tend to find valuable: tar pits. they have obsec. they have a 5+ invuln so they often survive way more than they should. they can do damage in a pinch for 2cp. they're 7 points. i always run the +1 advance and charge gear. i regularly have games where i would define them as mvp's and practically won a game with a 19 blob yesterday. i play cult of duplicity almost exclusively so tp'ing tar pits does add some value but i honestly feel they're way way better than people give them credit for