Cat.......I have customers that have several AP555E's and AP1055F's. So far they have proven to be reliable machines with little downtime. All the maintenance is done per the manufacturers schedule and the product support has been decent.
Bomag....I don't have any customers with these but I have seen a couple in the area. The product support from the dealers here lacks severely. This alone would keep me away.
Weiler........Its a good laydown machine but its the most difficult to repair that I have ever run across. There isnt anything easy to get to on these and product support from the dealer is so-so. They are heavier than the Leeboys which is why they gained popularity here the last few years.
Leeboy.......Some people like them, some don't. I've seen so many of these that I think I could disassemble and reassemble one in my sleep. I think there is hundreds of them here in Oklahoma. They are definitely a lighter machine and lays a good mat. They are definitely prone to electrical problems, conveyor chain failures, and the screed wear plates seem to wear out prematurely. Product support from the local dealer isn't all that great. The biggest issues I have ran across were due to lack of maintenance and periodic adjustments to the drive chains/conveyor chains. I would take a Leeboy 7 days a week over a Weiler.
I cant vouch for any other manufacturers. If I were you I would take a serious look at the product support aspect before you purchase anything. When I need tech info I don't even go to the dealer, I deal directly with the manufacturer. I have found that they all have been very helpful if I need a electrical or hydraulic schematic, or even testing specifications. I can tell you with confidence that the poor support is NOT the manufacturer of the paving equipment I deal with, its the dealer/distributor.