I got that same Hudy set, but you'll need another tool for the bulkhead screws in that Hexscrews kit. They are larger then the other heads; a 7/64 bit fits perfectly. It could be 3.5mm but I'm not sure, so I just use my 7/64.
The hudy drivers are very nice. I did break the very small one, though, so I need a new shaft for it. It was entirely my fault, I put way too much pressure on it and it actually sparked when it busted.
I also recently got a few GS Racing tools (a hardened flat and phillips) and they seem to be very good quality as well, and they have a flat side so they don't roll all over the place like the hudy drivers, which is my only complaint about them.
I purchased two sets of the Hexscrews when I got them so I'd have lots of screws. It's a good idea because although they give you some extras, there's some sizes where you won't have any extra. Plus, it's nice to be able to give a person at the track a nice replacement screw if they need one.
Even though the Hexscrews are very strong, they rust. Make sure you keep them dry; after running either wipe down the bottom of your buggy with a WD-40 cloth or spray them dry with a compressor or can of air. The RC-Screws are rust-proof, but you pay for that luxery with screws that strip and bend easily because of the higher alloy to steel ratio.
Good luck!