I'm coming at this from the opposite angle to
@Rosie 5678 above in that I've avoided clipping-in for many years but, having tried it for the first time this year, I'm very happy.
I was given a pair of cheap-and-cheerful Wellgo dual-sided SPD/flat pedals by my brother. I bought some even cheaper, yet equally cheerful,
Decathlon entry-level shoes to go with them. The cleats seem a bit "over to one side" but that's the odd nature of the shoes (you even have to hack a little "trap door" in them with a stanley knife to reveal the bolt holes!). Also have absolutely no idea about cleat position (they're in the forward position of the two available) but despite my lack of any adjustment, they feel comfortable and seem to work.
As I said, I resisted clipping-in for many years, fearing all kinds of terrifying incidents in which I was somehow dragged under steamrollers or into blast furnaces because I couldn't detach myself from my push-iron. Turns out it's all reasonably straight forward (other than having to get the SPD side up in order to clip in) and generally feels better, particularly going uphill. Wish I'd done it years ago!
I can't see myself going for the "proper" SPD SLs any time but am now tempted to try some double-sided SPDs, so I don't have to keep mucking about trying to get the clip side on top when setting off. That said, it's nice just to be able to use the flat side when I know it's only a short hop to the next set of lights or other cause to stop.
I guess it's one of those "suck it and see" things but I've been pleasantly surprised with it all. As they say on these online doodads, YMMV.
£29 shoes pictured below: