Agreed..Suspensions is one of those things you will have to try to know the answer. Everyone's balance of performance and comfort is different, and is very difficult to describe verbally. Something that's hard for you might not be hard to others.
Kinda like if I asked you to describe, how tall is tall? 160cm? 170cm? 180cm? Everyone will give a different answer.
Perhaps what you can do is note down what suspensions are you currently using, and people with experience can answer if the Teins are harder/softer in comparison with your current ones.
Tien super street used to cost about 3.4k (if i remember correctly, before yen exchange go up) for a brand new set. Perhaps what you would want to consider is that it costs RM300 to service each absorber (not sure if price increased) so under worst case scenario 4 x rm300 = 1.2k, add on to the 1.6k you buy the absorbers for is already almost the brand new price.
Worth it or not, you decide. =D