Papermate’s Inkjoy gel pens are really nice. Unfortunately it’s very difficult to get the 0.5mm version in the UK. It’s easier to find a really good deal on the 0.7mm version (finding a good deal is something that happened to me three times in the last two years) than to find the fine version at any price (something that has happened to me zero times in the last two years).
When I came across those three good deals I always bought them and every time I ended up with different versions. My oldest Inkjoys, retractable big barrel ones, were Made in Korea, but the later versions I bought, the retractable 300RT and the capped big barrel ones, were Made in India.
They all write great, but the cap of the capped version is a bit loose and less practical than the retractable version.