It was my intro into O16.5. I've built three of their loco kits and have several more in line. I've also put together one of their wagon kits. Best constructed with a decent superglue, they make a very reasonable model, easily modified and embellished with extra detailing.
I find it best to buy direct from Smallbrook, partly because they get ALL the profit which is fed back into the business. Don't buy on eBay because sellers there seem to inflate their prices as usual. I made one exception, when I bought a job lot including three wagons, a loco, all unmade and two Hornby chassis which most of the loco kits need, for £55.
These images show my first three models nearing completion.
Ken