Attached to medium fast carbon blade, adequate speed, good spin for looping and excellent control. I would recommend this for less skilled players (like me) who want to develop their looping game. Good value.

I agree with JimC. Good cheap replacement for Sriver FX, and also very good for beginning players who need to concentrate on technique development. Could work even with slow blades if you do not step away from the table.

Attached this to a LKT 9010 carbon blade on my forehand. To give an idea on tackiness it can pick up a ball from the table. However the rubber can't retain the ball. I went for this rubber after finding that a sheet of Hurracaine 2 was far to hard/fast as a rubber for me to loop with. The LKT rapid soft has a soft yellow sponge and a translucent-ish red topsheet which I like. The rubber is great for looping incoming slow balls as it has lots of control and the soft sponge allows the ball to dig in so you can impart your spin. Produces good spin from service however it won't generate as much as a really tacky sheet of Chinese rubber. Consequently it handles opponents spin better. I really like this rubber and I'd describe it as a tacky albeit slower version of Sriver. This could be too slow on a slower blade however on my blade I find it has acceptable speed. I would defiantly buy this rubber again as it suits my looping attack game and offers great control. It's also a great price!

love this rubber from the first attempt. on my BH, dwell time is very good and i can flip and loop better that my old rubber. i have a 2.2mm but it doesn't weight much.

This rubber is a Sriver EL clone, spin insensitive, medium-low throw, soft, with lots of control, with poor spin, great for blocking hitting and driving, great on carbon blades, cheap and very durable.

Details:

I tried this rubber in red on forehand. blade was galaxy t4 (off++). On the other side I had LKT pro XP black.

Rapid soft is similar in feel to LKT Pro XP black (red XP is harder). Differences are: Rapid soft is considerably faster than black XP (only in the top gear; the low gear is almost the same), is considerably less spinny, has slightly more gears, is slightly higher throw. It is softer than red XP and as soft as black XP.

gears: low and medium-fast gear. (Warning: Rapid Sound does not have a low gear, Rapid Soft does).

Opening loops: the arc is short but low. This is a very good thing: short arc means you have margin for error; low arc means your opening loop can't be easily attacked. However, the spin on opening loops is poor, unlike XP (both black and red), and surely not great as MercuryII 36 or good as Palio CJ8000 36.

Spin insensitive means that blocks, service returns and counterloops are very very easy. This is a strength of the rubber. Also hits and drives are great with this rubber.

Throw: low, slightly higher than sriver. Like LKT PRo XP black (higher than red). Like LKT rapid sound. Lower than H3, Acuda S2, T05, Vega Pro. If you are used to high throw on forehand, give it two days to get used to the low throw, and you will be surprised that you are more consistent.

Counterloops: great. They are very easy, due to the low throw and the spin insensitivity. Your counterloops will not be spinny but consistent, fast and low.

Spin: not tacky and not very grippy. Spin on opening loops is poor, reason why I switched to red XP. However rapid soft is softer so it has more of a low gear than red XP.

Speed: very good on carbon blades. On wood, it might be too slow for forehand.

Pushes: very easy but not very spinny. If you switch from Rapid Soft to vega pro or acuda s2, at first your counterpushes will go to net.

tackyness: almost completely non tacky. The protective sheet barely sticks to the rubber. Plays like a non tacky rubber (actually it is less grippy than many nontacky rubbers)

hardness: this is a soft rubber (about 35 in the DHS or Galaxy scale). This is what gives you the low gear.