Still going strong after several years of use in an installation.
There is no need for a terminator to be any larger than the XLR connector and this one is designed within that size.
This was installed a long time ago (between 5 years and 10) in a venue where I was doing regular freelance work. Once installed, I forgot it was even there. Things have moved on since then and I'm hardly ever at that venue any more but I do know that the terminator is still part of the lighting I installed and all are doing their job just fine. Bear in mind perhaps that this is a static installation so they never get knocked about like they might if they were part of a theatre's lantern stock or in hire stock.
You can easily make terminators yourself if you feel the need but these are convenient to buy, reliable and reasonably priced. If you're specifying for an installation, buy these ready made terminators: they will hardly make a difference to the total cost and will leave you free to concentrate on the bigger tasks.