I bough the Pure Freedom one on Black Friday and fitted it over Christmas. It's very well built and works well. It doesn't overspool and I like the soft start and the auto shutoff when it gets badly snagged. It also have a Spring speed controller which is good but after an hour or so it went up to 99 and has been there ever since
I looked at Grippatanks one and although it has a 2 year warranty, there where a few things that put me off, 1 of which was the lead time and it was only an estimate. Also their coupling seems like a brass hozeloc type swivel and I've never had one that didn't leak.
I did buy their through floor rollers and find they work well and seem strong with the 4 studs, although Pure Freedom have new floor rollers out very soon I think that look a bit more robust.