Cheryl's right, go see him.
But heres some things. For a Perch he is small, but for a horse he's big. And she is right standing at the end of a rope of a draft is a whole different feeling all together than being on the end of a lead with any other horse. I would stay away from this one. Drafts in general are very calm laid back unspooky animals. Although a Perch is more spooky than some of the other draft breeds. He most likely has that in him and it is not a trained responce.
Price- Very fair or even slightly high. There are a few different Draft auctions located around the country and prices are down. The high priced driving gelding great breeding, great show record, 12 yr old, rides/drives guarenteed sound sold for $11,000. High priced mare @ $9,700 and sale average @ $4,000. These are show animals some with nation registery points. A few good-not great,but good- anyone could own, get along with ride/drive sound teenagers with no vices sold for under $500.
If she says he needs to go to a trainer or owner with a trainer, I would believe her, he probably does. Your trainer[NOT a personal attack] Can't do Drafts. They are not strong, can/should be ridden in the mildest snaffle, with little to no rein pressure. There is no man strong enough to drive a 6 horse hitch if they were actually strong and pulling[That would be 12000 lbs of pull]They are built very uphill[head and neck above mid-shoulder height. They can sort of be a hard ride if trying alot of flexing, they have short/heavy necks which don't flex easily. I'm not sure what your looking to do with him, But as pleasure horses they are great. Remember they are custom designed to work long,slow,hard straight lines for hours, so certainly don't get one and expect it to be a performance horse.
Then you will need to consider cost- Find a farrier before getting a draft alot DON"T do them. And price is normally twice an average horse. Equipment-Although it is growing a little in popularity, hard to find usually buy from catalog. Trailers, some of your bigger guys can't fit in a standard trailer. Barn, Newer stables are fine but some older barns especially bank barns, are to small both in height and doorway width.
Good Luck- If its not this one theres another out there waiting. Just don't rush.