I have one of the Tower panels.
It's worked for about 4 years now.
Still works but the glo meter died this summer.
I'd probably buy it again but I'm goin all cordless this season.
Either the hobbico or the tower panel would be a good choice for $19.99
The $29 hobbico one seems to only have a different glo driver setup and a main battery meter for 10 bucks more. (the gloplug sensor might be cool)
They all have the cordless glo driver charger on em.
I think quality wise these 3 (tower and hobbico) are prob the same.
I have not seen the Cermark panel yet but I'm gonna look it up.