I don't like that feature either -- it allows the suspension to flex realistically (which is really nice with the heavy Jumbo sherman). However, I always glue it down as I don't want any movement on a completed model. As a matter of fact, I insert a tab of styrene instead of their rubber pads.
As for value, it depends on what you see. Other Sherman kits are either on par or $10 cheaper. As for accuracy and skillful engineering, my opinion is that they are the apex of 1/35 kits -- I disagree that they are "not much better than other companies" -- I would say they are setting the standard by which others are measured
Also, if a nicely built and painted Itaeri M4A1 is satisfactory to you, then by all means grab one at the local swap meet or EBay for $12. In that context, a $55 Tasca Sherman would makes no sense. Save the bucks and take the wife out. But if you want to treat yourself to a GREAT Sherman tank, go Tasca.
Again, my two cents.