same as paul says. try before you buy. i had a couple of pro sports from new. very good straight out the box. they shot like they were wore in straight away.
my hw97kt was a little rougher out the box, but once fired in was a dream to shoot. tx's are very good too. if i were to go for a tx it would be the rifle and not the carbine as they seem a little smoother to shoot and a bit less hold sensitive.
for me though its hw all the way. the hw97 is the daddy of the underlever imo.