I have had the same 2 Waterman pens for well over 20 years and they have always performed well, however, they have recently started having blow-outs and covering everything in ink. The worst blow-out included me transferring the ink to my face whilst I was presenting to an audience of about 20 other engineers and as I had deep, dark red ink, it made me look like I'd taken a blade to my head. Luckily, I'm able to laugh at myself, but decided I would get a new pen.
In the past 2 months, I have purchased the following pens:
TWSBI, as seen on the OP - only £1 more than it was in 2020, so not a massive increase.
Kaweco Sport with gold nib and 5 packs of ruby red cartridges.
I decided after seeing the colour of Writer's Blood in a note I was sent, that I liked it, as it's a fair bit darker than the ruby red. I also thought I should at least get a dark blue ink so that it wasn't just red, or black that I have had for the last 10 years. However, it's my wife that has been using that.
After using the TWSBI for a month solid, I really like it and so far I've not covered myself in ink!
The sport has been used on and off when I've been making notes and I'll use it when I travel for work.
Not just shaving that TSR has helped me with.