I've been pondering whether to get one of these

Have one of these and can recommend. It comes apart in half lengthways down the middle and is held together by magnets, so it's super easy to clean (which is definitely something to look for in any smoking implement, I feel).

do you have the mini or full size one?

The mini. Couldn't find the full size one anywhere at the time I wanted one.

and a fairly smooth smoke?

currently weighing up whether to get a mini or bite the bullet and invest in a venty . . . .

Fairly smooth, considering you're smoking hash through a not very long length. I had a Silver Palm Leaf pipe years ago and it compares very favourably with that with regards to hit and ease of cleaning. It made me want the bigger pipe though, after a while, but that's not as easily palm-able.

Oh, that is lovely. Reviews seem favourable too

Glen’s Briar glass pipe otherwise known as Aragorns Pipe. That’s if you like vaping hash. Basically it’s the old hot knives technique. Bit of a learning curve to it.

The Hoj recommendation is a good one, they are super easy to clean also versatile in terms of being able to use for different types and quality of hash.

You could also take a look at:

https://smokeheir.com - Handpipe. You can get carbon filters to make even more smooth. All their kit is super good quality and you’ll find discounts that will cover the cost of import.

https://www.youtube.com/watch?v=9zT5m1dys0A - Hash Lanterns. Not very discreet but great fun and you’ll feel like Willy Wonka.
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Second the Hoj, best pipe I’ve ever had, as stated before easy to clean and gives a nice cool smoke. 10/10