I have a Singer O/L from Lidl (when I lived in UK) and I find it great for doing long, straight seams. So for curtains, bags... it's great. I am wary of it for clothing seams, such as armholes & necklines. I don't make as much use of it as I could.
As far as I can tell, the Lidl Pfaff has more stitch options than my Janome, but it doesn't have a speed limiter, needle up/down option, both of which my Janome does have. I am looking forward to giving it a go.