I like what we have seen of the mecha design. I hope they just stick to this set for a bit and choke the show to death in a deluge of toy debuts.
I'm not really sold on the suits. That could change, designs I was put off by at first have grown on me before. Other's have remained just as ugly by episode 49 or 50 as they were in the earliest preview pic. These I don't even think are awful they're just...well I'll put it this way when I first saw the pic I thought it had to be a fake. Maybe if the silver bits continued down the legs it'd bring it more together for me, I don't know.
I like bringing back a wrist changer but had to raise an eyebrow at the sunglasses. (and yeah, I know it's an UltraSeven thing) Though I like that the lense stays mounted on the device and the heroes have to hold it up to their eyes (at least if the way they show the little boy doing it is accurate to the series itself). That at least makes it feel more like a unique device and by that I mean not a unique device in the context of other henshin devices but a unique device in terms of being a special out of the ordinary thing the heroes get their powers from.
Sometimes the "what if this seeming normal everyday object secretly gave you superpowers" thing is a lot of fun, but other times it doesn't work. I like seeing unique devices to.