The difference between a bivvy and even a very small, single-skin tent is immense, because you're not in contact with the fabric (other than groundsheet) in a tent. Much more restful, as you don't get soaked in condensation.
Looking at the reviews of the Gelert and lanterne's experience, it seems I was lucky with mine. OTOH, the only real problem reported seems to be the poles - I'd be inclined to just bring some gaffa tape with me as the tent itself is reported to be dandy and there's nothing to touch it for anywhere near the same price.
The difference between a bivvy and even a very small, single-skin tent is immense, because you're not in contact with the fabric (other than groundsheet) in a tent. Much more restful, as you don't get soaked in condensation.
Looking at the reviews of the Gelert and lanterne's experience, it seems I was lucky with mine. OTOH, the only real problem reported seems to be the poles - I'd be inclined to just bring some gaffa tape with me as the tent itself is reported to be dandy and there's nothing to touch it for anywhere near the same price.