In my opinion a kit like that would be more trouble than it would be worth. It appears each implement has an interchangeable handle, so the four tools can become 32 tools with different handle lengths.

While the kit would take less space than the 32 tools, I believe in practice you would end up using only a half dozen combinations. ie Would you ever use the short handle on the broom, or a short handled rake? Would you want to take the kit out in the garden where you are working, and take the time to find then change the handle of a tool as you needed it? Do you really use shovels of four different handle lengths when gardening.

In practice you may use a round shovel with a long handle, possible a long and a short flat shovel, a rake, and a broom, If you assume $30 a piece, that is $150 for the tools you use verses the $370 plus shipping that the kit cost.