Like we've said (some with more passion than others
) this stick is very ordinary and IMO only to be used as an entry point into fight sticks and/or modding.
After modding mine with some Sanwa buttons, I quickly moved onto something better (putting in a Sanwa JLF & trying Crown buttons) then ended building my own from scratch. Since I dont use the T6 anymore, I am also considering turning it into a hitbox, but ONLY to see if I like hitbox. If I do, I'll make a serious one.
As for the lag, well... its a matter of opinion. After playing with the wirelss one for a while then swtiching to a wired one, I noticed there definately WAS lag, but it was only slight and really only noticable when I was doing the fastest of inputs. That aside, there is nothing I can't do with the wireless one, that I cant do with the wired one, I just need to input some things a little bit quicker.
Overall, not a big deal initially but once you get better, faster and notice the very finer points of the game it will it be apparent. To sumize, I would have a go at hitboxing it, just buying 4x new buttons (you dont want to spend much on it even though you just pull it all out). If you like it, then look into a better & wired hitbox.