We tried HWT with our dysgraphic ds and had absolutely no success with it, so my first reaction is... if his teacher isn't concerned, and it's your concern... you might want to just try purchasing an inexpensive workbook for practice rather than worrying about buying into HWT (because it can get rather costly).

If you purchase HWT materials, fwiw, my opinion is you don't need to purchase the teachers manual - I would just start with the grade level workbooks.

Before I purchased anything though, I'd probably want to know a few things about how my ds was writing:

* Is his pencil grip normal?
* Is he using good posture?
=> If the answer is no to either of these, just working on these might improve his handwriting immensely without having to work on HWT or another set of hw drills at home).

* Is he using consistent letter formation?
* Is he forming letters the way he was taught in school?
=> If he's not, HWT or another handwriting program/practice at home will probably help (unless something else is going on such as a fine motor challenge or vision challenge etc).

* Does he complain of his hand hurting while he writes?
* Does he refuse to write for longer than a minute or so?
* Does he have uneven pencil pressure, do his papers end up crumpled up?
* Is he reversing letters?
=> If he's doing any of this, it might be developmentally age-appropriate, or it could be symptoms of dysgraphia - and I'd want a screening to help determine if there is an issue before trying out HWT etc.

Last thing, does his handwriting look really poor when you compare it to other kids' hw in his class at school? If not, honestly I probably wouldn't worry about it too much unless he actually enjoys the extra work at home. Our elementary did not do much hw practice after K/1 until learning cursive in 4th grade. For the typically developing kids, there was a wide range of neatness of appearance of their handwriting up through most of third grade, but most kids (kids who were consistently forming their letters and using ok grip/posture) made great strides in neatness etc once the amount of writing started to pick up in 3rd/4th grade.

Best wishes,

polarbear