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Any suggestion on sizes to start - any particular combo more useful?

I suspect a long one at least in the set.

Are these better than a long board?

some of the shapes might be handy to avoid making your own, but real sandpaper is best IMO, on whatever power sander is appropriate .... making shapes for hand sanding the odd places isn't too bad either using that expanding spray foam, make it any shape - and the rubbery rollers from a wringer washer are great

Bill

I bought a set from Eastwood. It includes the long board and a variety of shorter ones. The short thin one was very valuable because you could bend it a bit to the contour of a curve. I bought two roles of adhesive backed sandpaper. Just cut to the size of the Durablock and adhere it. Works great. The sandpaper works with my other long board sanders including the air powered ones. You can live without the Durablocks, but I thought it was worth it. I especially like that some will bend slightly if you need them to.I bought the starter set, about $50 I think.

The Durablock starter kit was perfect and used extensively during my build. Well worth the investment.

what was your starter kit jomichael? From Eastwood?

thanks for the replies.

I got this one and used every one of the blocks. Of course the two longest were used most.
Durablock kit
If you are new to blocking panels, then this kit comes with instructional CD's. I have not seen them but I am sure they have some good stuff on 'em.
Durablock kit with CD's

By the way, if you are going to block your vehicle I would guess you are also spraying 2k primer? If so, I used this spray gun kit. It sprays primer really well and is a great starter gun.
Spray gun kit