I have their 4’ version that looks similar, I use them for my tomatoes and peppers to start in the spring, they work fine for that so believe they would work for getting clones started. I wouldn’t try long term vegging or flowering, but getting clones started they don’t need much.
If you are looking for a deal I'd just make your own. Peat moss, aeration, and vermi/compost 1:1:1 by volume and add an all purpose fertilizer like Dr Earth or Down to Earth.
If you are looking for a deal I'd just make your own. Peat moss, aeration, and vermi/compost 1:1:1 by volume and add an all purpose fertilizer like Dr Earth or Down to Earth.