That brand is what I typically install when installing that type of heater. They are made at a plant that is about 100 miles from me.
They are a little pricey compared to say baseboard heaters, but don't have the limitations and hazards of blocking them with furniture and other objects, which is a big safety thing IMO.
Yes you do get a fair amount of heat build up near the ceiling - they are simply a heating element attached to the back side of an aluminum panel, that aluminum panel radiates heat into the space it is pointed at. There is still some convection heating that rises from the unit though.
Placement is important. Do not place them directly across from a window - radiant heat will be lost through the window, you want it to heat objects in the room which in turn keep the room warm. Ceiling fans or other air circulation will help stir up excess heat that accumulates near the ceiling.
They are not necessarily the greatest for space with exterior concrete walls (unfinished on interior side), unless mounted on that wall and pointed "inside". What happens if you point them at that exterior wall is the concrete wall soaks up radiant heat and transfers it to exterior, can have some issues with unfinished concrete floors on grade also. Not that they won't work, but may not be quite as efficient as you will be heating that floor and earth instead of your space. Furniture and other objects in the room will give different performance than an empty room with concrete walls/floors though as you heat those objects instead of the concrete.
Because they are radiant heaters, they do make the room feel warmer than the actual air temperature - objects in the room are warmer than they are with other heating systems, radiant heat hitting your skin while the unit is on makes you feel warmer. Some don't like it, others love it. If you are a person that claims to be cold all the time, you probably are one that loves it. If you are a person that claims to be hot quite often - you may not like it.
