Do not buy the spider pen unless you wear a suit. It is a bit bulky.
Absolutely trash advice. This person has an extremely narrow point of view and likely does not even own the trick.
1) This trick has dropped an uncountable amount of panties for me, its very open and visual, and makes you feel like a jedi.
2) The pen as has never, not once, been questioned or pointed out by a spectator, and I have never once used it while wearing a suit. In fact I don't even own a suit.
3) I use it with dress shirts, t-shirts, jackets, hoodies, and even NO SHIRT AT ALL because it's easy to use from pant pockets like blue jeans.
Here are 2 pics taken 2 secs apart showing the 2 most popular positions for ME when performing:
(the pen in these pictures is the Spider Pen Pro, but I own both and they're the same size.)