are these jets any good?

That is a good supplier, but the ad says it is the stock replacement (goes in airbox) yet the pic shows a clamp-on. The ad also says pic is of the actual filter. Confusing.

Contact them or try this one.
Yamaha YSF200 YSF 200 Blaster Air Filter UNI 88-06 - eBay (item 260606340775 end time Jan-14-11 18:59:18 PST)

Also, make sure you buy a two-stage. Uni makes some single stage ones that are just black. Personally, I've been thinkin about trying one of these. Yamaha YFS200 YFS 200 BLASTER Air Filter 88-06 - eBay (item 250618441305 end time Jan-14-11 12:57:28 PST)

Maxima makes excellent oils. Stands to reason they would make a good filter, and you can't beat the price.
 
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btw whats the difference between a pilot jet and a main jet and will i need a new needle or anything like that with the bigger jet?

The pilot jet feeds the low speed circuits (off idle and idle). The vito's kit had a smaller one and a new needle. The smaller pilot is a surprise but if it works with the rest of the parts, cool. Their custom needle is made just for them (supposedly) so just follow the kit instructions for that.